@paypal/paypal-js - npm Package Compare versions

Comparing version 2.1.9 to 3.0.0

dist/paypal.browser.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -25,3 +25,3 @@ *
 
-      if (objectSize(currentScript.dataset) !== objectSize(nextScript.dataset)) {
+      if (Object.keys(currentScript.dataset).length !== Object.keys(nextScript.dataset).length) {
         return null;
@@ -32,3 +32,3 @@ }
 
-      forEachObjectKey(currentScript.dataset, function (key) {
+      Object.keys(currentScript.dataset).forEach(function (key) {
         if (currentScript.dataset[key] !== nextScript.dataset[key]) {
@@ -58,13 +58,24 @@ isExactMatch = false;
 
-      var processedOptions = {
+      var processedMerchantIDAttributes = processMerchantID(options["merchant-id"], options["data-merchant-id"]);
+      var newOptions = Object.assign(options, processedMerchantIDAttributes);
+
+      var _Object$keys$filter$r = Object.keys(newOptions).filter(function (key) {
+        return typeof newOptions[key] !== "undefined" && newOptions[key] !== null && newOptions[key] !== "";
+      }).reduce(function (accumulator, key) {
+        var value = newOptions[key].toString();
+
+        if (key.substring(0, 5) === "data-") {
+          accumulator.dataAttributes[key] = value;
+        } else {
+          accumulator.queryParams[key] = value;
+        }
+
+        return accumulator;
+      }, {
         queryParams: {},
         dataAttributes: {}
-      };
-      forEachObjectKey(options, function (key) {
-        var keyType = key.substring(0, 5) === "data-" ? "dataAttributes" : "queryParams"; // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      }),
+          queryParams = _Object$keys$filter$r.queryParams,
+          dataAttributes = _Object$keys$filter$r.dataAttributes;
 
-        processedOptions[keyType][key] = options[key].toString();
-      });
-      var queryParams = processedOptions.queryParams,
-          dataAttributes = processedOptions.dataAttributes;
       return {
@@ -77,3 +88,3 @@ url: "".concat(sdkBaseURL, "?").concat(objectToQueryString(queryParams)),
       var queryString = "";
-      forEachObjectKey(params, function (key) {
+      Object.keys(params).forEach(function (key) {
         if (queryString.length !== 0) queryString += "&";
@@ -89,3 +100,3 @@ queryString += key + "=" + params[key];
       newScript.src = url;
-      forEachObjectKey(dataAttributes, function (key) {
+      Object.keys(dataAttributes).forEach(function (key) {
         newScript.setAttribute(key, dataAttributes[key]);
@@ -98,40 +109,44 @@
       return newScript;
-    } // uses es3 to avoid requiring polyfills for Array.prototype.forEach and Object.keys
+    }
 
+    function processMerchantID(merchantID, dataMerchantID) {
+      var newMerchantID = "";
+      var newDataMerchantID = "";
 
-    function forEachObjectKey(obj, callback) {
-      for (var key in obj) {
-        if (Object.prototype.hasOwnProperty.call(obj, key)) {
-          callback(key);
+      if (Array.isArray(merchantID)) {
+        if (merchantID.length > 1) {
+          newMerchantID = "*";
+          newDataMerchantID = merchantID.toString();
+        } else {
+          newMerchantID = merchantID.toString();
         }
+      } else if (typeof merchantID === "string" && merchantID.length > 0) {
+        newMerchantID = merchantID;
+      } else if (typeof dataMerchantID === "string" && dataMerchantID.length > 0) {
+        newMerchantID = "*";
+        newDataMerchantID = dataMerchantID;
       }
-    }
 
-    function objectSize(obj) {
-      var size = 0;
-      forEachObjectKey(obj, function () {
-        return size++;
-      });
-      return size;
+      return {
+        "merchant-id": newMerchantID,
+        "data-merchant-id": newDataMerchantID
+      };
     }
 
-    var loadingPromise;
-    var isLoading = false;
+    /**
+     * Load the Paypal JS SDK script asynchronously.
+     *
+     * @param {Object} options - used to configure query parameters and data attributes for the JS SDK.
+     * @param {PromiseConstructor} [PromisePonyfill=window.Promise] - optional Promise Constructor ponyfill.
+     * @return {Promise<Object>} paypalObject - reference to the global window PayPal object.
+     */
+
     function loadScript(options, PromisePonyfill) {
-      if (!(options instanceof Object)) {
-        throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");
-      }
+      validateArguments(options, PromisePonyfill);
 
       if (typeof PromisePonyfill === "undefined") {
-        // default to using window.Promise as the Promise implementation
-        if (typeof Promise === "undefined") {
-          throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");
-        }
+        PromisePonyfill = getDefaultPromiseImplementation();
+      }
 
-        PromisePonyfill = Promise;
-      } // resolve with the existing promise when the script is loading
-
-
-      if (isLoading) return loadingPromise;
-      return loadingPromise = new PromisePonyfill(function (resolve, reject) {
+      return new PromisePonyfill(function (resolve, reject) {
         // resolve with null when running in Node
@@ -142,7 +157,11 @@ if (typeof window === "undefined") return resolve(null);
             url = _processOptions.url,
-            dataAttributes = _processOptions.dataAttributes; // resolve with the existing global paypal object when a script with the same src already exists
+            dataAttributes = _processOptions.dataAttributes;
 
+        var namespace = dataAttributes["data-namespace"] || "paypal";
+        var existingWindowNamespace = getPayPalWindowNamespace(namespace); // resolve with the existing global paypal namespace when a script with the same params already exists
 
-        if (findScript(url, dataAttributes) && window.paypal) return resolve(window.paypal);
-        isLoading = true;
+        if (findScript(url, dataAttributes) && existingWindowNamespace) {
+          return resolve(existingWindowNamespace);
+        }
+
         insertScriptElement({
@@ -152,8 +171,7 @@ url: url,
           onSuccess: function onSuccess() {
-            isLoading = false;
-            if (window.paypal) return resolve(window.paypal);
-            return reject(new Error("The window.paypal global variable is not available."));
+            var newWindowNamespace = getPayPalWindowNamespace(namespace);
+            if (newWindowNamespace) return resolve(newWindowNamespace);
+            return reject(new Error("The window.".concat(namespace, " global variable is not available.")));
           },
           onError: function onError() {
-            isLoading = false;
             return reject(new Error("The script \"".concat(url, "\" didn't load correctly.")));
@@ -165,4 +183,31 @@ }
 
-    var version = "2.1.9";
+    function validateArguments(options, PromisePonyfill) {
+      if (typeof options !== "object" || options === null) {
+        throw new Error("Invalid arguments. Expected options to be an object.");
+      }
 
+      if (typeof PromisePonyfill === "undefined") {
+        return;
+      }
+
+      if (typeof PromisePonyfill !== "function") {
+        throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.");
+      }
+    }
+
+    function getDefaultPromiseImplementation() {
+      if (typeof Promise === "undefined") {
+        throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");
+      }
+
+      return Promise;
+    }
+
+    function getPayPalWindowNamespace(namespace) {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      return window[namespace];
+    }
+
+    var version = "3.0.0";
+
     exports.loadScript = loadScript;
@@ -169,0 +214,0 @@ exports.version = version;

dist/paypal.browser.min.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -17,2 +17,2 @@ *
  */
-var paypalLoadScript=function(t){"use strict";function r(t){var r="";return n(t,(function(e){0!==r.length&&(r+="&"),r+=e+"="+t[e]})),r}function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},e=document.createElement("script");return e.src=t,n(r,(function(t){e.setAttribute(t,r[t]),"data-csp-nonce"===t&&e.setAttribute("nonce",r["data-csp-nonce"])})),e}function n(t,r){for(var e in t)Object.prototype.hasOwnProperty.call(t,e)&&r(e)}function a(t){var r=0;return n(t,(function(){return r++})),r}var o,i=!1;return t.loadScript=function(t,u){if(!(t instanceof Object))throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");if(void 0===u){if("undefined"==typeof Promise)throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");u=Promise}return i?o:o=new u((function(o,u){if("undefined"==typeof window)return o(null);var c=function(t){var e="https://www.paypal.com/sdk/js";t.sdkBaseURL&&(e=t.sdkBaseURL,delete t.sdkBaseURL);var a={queryParams:{},dataAttributes:{}};n(t,(function(r){var e="data-"===r.substring(0,5)?"dataAttributes":"queryParams";a[e][r]=t[r].toString()}));var o=a.queryParams,i=a.dataAttributes;return{url:"".concat(e,"?").concat(r(o)),dataAttributes:i}}(t),s=c.url,d=c.dataAttributes;if(function(t,r){var o=document.querySelector('script[src="'.concat(t,'"]'));if(null===o)return null;var i=e(t,r);if(a(o.dataset)!==a(i.dataset))return null;var u=!0;return n(o.dataset,(function(t){o.dataset[t]!==i.dataset[t]&&(u=!1)})),u?o:null}(s,d)&&window.paypal)return o(window.paypal);i=!0,function(t){var r=t.url,n=t.dataAttributes,a=t.onSuccess,o=t.onError,i=e(r,n);i.onerror=o,i.onload=a,document.head.insertBefore(i,document.head.firstElementChild)}({url:s,dataAttributes:d,onSuccess:function(){return i=!1,window.paypal?o(window.paypal):u(new Error("The window.paypal global variable is not available."))},onError:function(){return i=!1,u(new Error('The script "'.concat(s,"\" didn't load correctly.")))}})}))},t.version="2.1.9",Object.defineProperty(t,"__esModule",{value:!0}),t}({});paypalLoadScript=paypalLoadScript.loadScript;
+var paypalLoadScript=function(t){"use strict";function e(t){var e="https://www.paypal.com/sdk/js";t.sdkBaseURL&&(e=t.sdkBaseURL,delete t.sdkBaseURL);var n=function(t,e){var r="",n="";Array.isArray(t)?t.length>1?(r="*",n=t.toString()):r=t.toString():"string"==typeof t&&t.length>0?r=t:"string"==typeof e&&e.length>0&&(r="*",n=e);return{"merchant-id":r,"data-merchant-id":n}}(t["merchant-id"],t["data-merchant-id"]),a=Object.assign(t,n),o=Object.keys(a).filter((function(t){return void 0!==a[t]&&null!==a[t]&&""!==a[t]})).reduce((function(t,e){var r=a[e].toString();return"data-"===e.substring(0,5)?t.dataAttributes[e]=r:t.queryParams[e]=r,t}),{queryParams:{},dataAttributes:{}}),i=o.queryParams,c=o.dataAttributes;return{url:"".concat(e,"?").concat(r(i)),dataAttributes:c}}function r(t){var e="";return Object.keys(t).forEach((function(r){0!==e.length&&(e+="&"),e+=r+"="+t[r]})),e}function n(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},r=document.createElement("script");return r.src=t,Object.keys(e).forEach((function(t){r.setAttribute(t,e[t]),"data-csp-nonce"===t&&r.setAttribute("nonce",e["data-csp-nonce"])})),r}function a(t){return window[t]}return t.loadScript=function(t,r){return function(t,e){if("object"!=typeof t||null===t)throw new Error("Invalid arguments. Expected options to be an object.");if(void 0===e)return;if("function"!=typeof e)throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.")}(t,r),void 0===r&&(r=function(){if("undefined"==typeof Promise)throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");return Promise}()),new r((function(r,o){if("undefined"==typeof window)return r(null);var i=e(t),c=i.url,u=i.dataAttributes,s=u["data-namespace"]||"paypal",d=a(s);if(function(t,e){var r=document.querySelector('script[src="'.concat(t,'"]'));if(null===r)return null;var a=n(t,e);if(Object.keys(r.dataset).length!==Object.keys(a.dataset).length)return null;var o=!0;return Object.keys(r.dataset).forEach((function(t){r.dataset[t]!==a.dataset[t]&&(o=!1)})),o?r:null}(c,u)&&d)return r(d);!function(t){var e=t.url,r=t.dataAttributes,a=t.onSuccess,o=t.onError,i=n(e,r);i.onerror=o,i.onload=a,document.head.insertBefore(i,document.head.firstElementChild)}({url:c,dataAttributes:u,onSuccess:function(){var t=a(s);return t?r(t):o(new Error("The window.".concat(s," global variable is not available.")))},onError:function(){return o(new Error('The script "'.concat(c,"\" didn't load correctly.")))}})}))},t.version="3.0.0",Object.defineProperty(t,"__esModule",{value:!0}),t}({});paypalLoadScript=paypalLoadScript.loadScript;

dist/paypal.esm.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -22,3 +22,3 @@ *
 
-  if (objectSize(currentScript.dataset) !== objectSize(nextScript.dataset)) {
+  if (Object.keys(currentScript.dataset).length !== Object.keys(nextScript.dataset).length) {
     return null;
@@ -29,3 +29,3 @@ }
 
-  forEachObjectKey(currentScript.dataset, function (key) {
+  Object.keys(currentScript.dataset).forEach(function (key) {
     if (currentScript.dataset[key] !== nextScript.dataset[key]) {
@@ -55,13 +55,24 @@ isExactMatch = false;
 
-  var processedOptions = {
+  var processedMerchantIDAttributes = processMerchantID(options["merchant-id"], options["data-merchant-id"]);
+  var newOptions = Object.assign(options, processedMerchantIDAttributes);
+
+  var _Object$keys$filter$r = Object.keys(newOptions).filter(function (key) {
+    return typeof newOptions[key] !== "undefined" && newOptions[key] !== null && newOptions[key] !== "";
+  }).reduce(function (accumulator, key) {
+    var value = newOptions[key].toString();
+
+    if (key.substring(0, 5) === "data-") {
+      accumulator.dataAttributes[key] = value;
+    } else {
+      accumulator.queryParams[key] = value;
+    }
+
+    return accumulator;
+  }, {
     queryParams: {},
     dataAttributes: {}
-  };
-  forEachObjectKey(options, function (key) {
-    var keyType = key.substring(0, 5) === "data-" ? "dataAttributes" : "queryParams"; // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  }),
+      queryParams = _Object$keys$filter$r.queryParams,
+      dataAttributes = _Object$keys$filter$r.dataAttributes;
 
-    processedOptions[keyType][key] = options[key].toString();
-  });
-  var queryParams = processedOptions.queryParams,
-      dataAttributes = processedOptions.dataAttributes;
   return {
@@ -74,3 +85,3 @@ url: "".concat(sdkBaseURL, "?").concat(objectToQueryString(queryParams)),
   var queryString = "";
-  forEachObjectKey(params, function (key) {
+  Object.keys(params).forEach(function (key) {
     if (queryString.length !== 0) queryString += "&";
@@ -86,3 +97,3 @@ queryString += key + "=" + params[key];
   newScript.src = url;
-  forEachObjectKey(dataAttributes, function (key) {
+  Object.keys(dataAttributes).forEach(function (key) {
     newScript.setAttribute(key, dataAttributes[key]);
@@ -95,40 +106,44 @@
   return newScript;
-} // uses es3 to avoid requiring polyfills for Array.prototype.forEach and Object.keys
+}
 
+function processMerchantID(merchantID, dataMerchantID) {
+  var newMerchantID = "";
+  var newDataMerchantID = "";
 
-function forEachObjectKey(obj, callback) {
-  for (var key in obj) {
-    if (Object.prototype.hasOwnProperty.call(obj, key)) {
-      callback(key);
+  if (Array.isArray(merchantID)) {
+    if (merchantID.length > 1) {
+      newMerchantID = "*";
+      newDataMerchantID = merchantID.toString();
+    } else {
+      newMerchantID = merchantID.toString();
     }
+  } else if (typeof merchantID === "string" && merchantID.length > 0) {
+    newMerchantID = merchantID;
+  } else if (typeof dataMerchantID === "string" && dataMerchantID.length > 0) {
+    newMerchantID = "*";
+    newDataMerchantID = dataMerchantID;
   }
-}
 
-function objectSize(obj) {
-  var size = 0;
-  forEachObjectKey(obj, function () {
-    return size++;
-  });
-  return size;
+  return {
+    "merchant-id": newMerchantID,
+    "data-merchant-id": newDataMerchantID
+  };
 }
 
-var loadingPromise;
-var isLoading = false;
+/**
+ * Load the Paypal JS SDK script asynchronously.
+ *
+ * @param {Object} options - used to configure query parameters and data attributes for the JS SDK.
+ * @param {PromiseConstructor} [PromisePonyfill=window.Promise] - optional Promise Constructor ponyfill.
+ * @return {Promise<Object>} paypalObject - reference to the global window PayPal object.
+ */
+
 function loadScript(options, PromisePonyfill) {
-  if (!(options instanceof Object)) {
-    throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");
-  }
+  validateArguments(options, PromisePonyfill);
 
   if (typeof PromisePonyfill === "undefined") {
-    // default to using window.Promise as the Promise implementation
-    if (typeof Promise === "undefined") {
-      throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");
-    }
+    PromisePonyfill = getDefaultPromiseImplementation();
+  }
 
-    PromisePonyfill = Promise;
-  } // resolve with the existing promise when the script is loading
-
-
-  if (isLoading) return loadingPromise;
-  return loadingPromise = new PromisePonyfill(function (resolve, reject) {
+  return new PromisePonyfill(function (resolve, reject) {
     // resolve with null when running in Node
@@ -139,7 +154,11 @@ if (typeof window === "undefined") return resolve(null);
         url = _processOptions.url,
-        dataAttributes = _processOptions.dataAttributes; // resolve with the existing global paypal object when a script with the same src already exists
+        dataAttributes = _processOptions.dataAttributes;
 
+    var namespace = dataAttributes["data-namespace"] || "paypal";
+    var existingWindowNamespace = getPayPalWindowNamespace(namespace); // resolve with the existing global paypal namespace when a script with the same params already exists
 
-    if (findScript(url, dataAttributes) && window.paypal) return resolve(window.paypal);
-    isLoading = true;
+    if (findScript(url, dataAttributes) && existingWindowNamespace) {
+      return resolve(existingWindowNamespace);
+    }
+
     insertScriptElement({
@@ -149,8 +168,7 @@ url: url,
       onSuccess: function onSuccess() {
-        isLoading = false;
-        if (window.paypal) return resolve(window.paypal);
-        return reject(new Error("The window.paypal global variable is not available."));
+        var newWindowNamespace = getPayPalWindowNamespace(namespace);
+        if (newWindowNamespace) return resolve(newWindowNamespace);
+        return reject(new Error("The window.".concat(namespace, " global variable is not available.")));
       },
       onError: function onError() {
-        isLoading = false;
         return reject(new Error("The script \"".concat(url, "\" didn't load correctly.")));
@@ -162,4 +180,31 @@ }
 
-var version = "2.1.9";
+function validateArguments(options, PromisePonyfill) {
+  if (typeof options !== "object" || options === null) {
+    throw new Error("Invalid arguments. Expected options to be an object.");
+  }
 
+  if (typeof PromisePonyfill === "undefined") {
+    return;
+  }
+
+  if (typeof PromisePonyfill !== "function") {
+    throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.");
+  }
+}
+
+function getDefaultPromiseImplementation() {
+  if (typeof Promise === "undefined") {
+    throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");
+  }
+
+  return Promise;
+}
+
+function getPayPalWindowNamespace(namespace) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  return window[namespace];
+}
+
+var version = "3.0.0";
+
 export { loadScript, version };

dist/paypal.legacy.browser.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -347,3 +347,4 @@ *
       // check if the new script has the same number of data attributes
-      if (objectSize(currentScript.dataset) !== objectSize(nextScript.dataset)) {
+      if (Object.keys(currentScript.dataset).length !==
+          Object.keys(nextScript.dataset).length) {
           return null;
@@ -353,3 +354,3 @@ }
       // check if the data attribute values are the same
-      forEachObjectKey(currentScript.dataset, (key) => {
+      Object.keys(currentScript.dataset).forEach((key) => {
           if (currentScript.dataset[key] !== nextScript.dataset[key]) {
@@ -373,12 +374,23 @@ isExactMatch = false;
       }
-      const processedOptions = {
+      const processedMerchantIDAttributes = processMerchantID(options["merchant-id"], options["data-merchant-id"]);
+      const newOptions = Object.assign(options, processedMerchantIDAttributes);
+      const { queryParams, dataAttributes } = Object.keys(newOptions)
+          .filter((key) => {
+          return (typeof newOptions[key] !== "undefined" &&
+              newOptions[key] !== null &&
+              newOptions[key] !== "");
+      })
+          .reduce((accumulator, key) => {
+          const value = newOptions[key].toString();
+          if (key.substring(0, 5) === "data-") {
+              accumulator.dataAttributes[key] = value;
+          }
+          else {
+              accumulator.queryParams[key] = value;
+          }
+          return accumulator;
+      }, {
           queryParams: {},
           dataAttributes: {},
-      };
-      forEachObjectKey(options, (key) => {
-          const keyType = key.substring(0, 5) === "data-" ? "dataAttributes" : "queryParams";
-          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-          processedOptions[keyType][key] = options[key].toString();
       });
-      const { queryParams, dataAttributes } = processedOptions;
       return {
@@ -391,3 +403,3 @@ url: `${sdkBaseURL}?${objectToQueryString(queryParams)}`,
       let queryString = "";
-      forEachObjectKey(params, (key) => {
+      Object.keys(params).forEach((key) => {
           if (queryString.length !== 0)
@@ -402,3 +414,3 @@ queryString += "&";
       newScript.src = url;
-      forEachObjectKey(dataAttributes, (key) => {
+      Object.keys(dataAttributes).forEach((key) => {
           newScript.setAttribute(key, dataAttributes[key]);
@@ -411,33 +423,41 @@ if (key === "data-csp-nonce") {
   }
-  // uses es3 to avoid requiring polyfills for Array.prototype.forEach and Object.keys
-  function forEachObjectKey(obj, callback) {
-      for (const key in obj) {
-          if (Object.prototype.hasOwnProperty.call(obj, key)) {
-              callback(key);
+  function processMerchantID(merchantID, dataMerchantID) {
+      let newMerchantID = "";
+      let newDataMerchantID = "";
+      if (Array.isArray(merchantID)) {
+          if (merchantID.length > 1) {
+              newMerchantID = "*";
+              newDataMerchantID = merchantID.toString();
           }
+          else {
+              newMerchantID = merchantID.toString();
+          }
       }
+      else if (typeof merchantID === "string" && merchantID.length > 0) {
+          newMerchantID = merchantID;
+      }
+      else if (typeof dataMerchantID === "string" &&
+          dataMerchantID.length > 0) {
+          newMerchantID = "*";
+          newDataMerchantID = dataMerchantID;
+      }
+      return {
+          "merchant-id": newMerchantID,
+          "data-merchant-id": newDataMerchantID,
+      };
   }
-  function objectSize(obj) {
-      let size = 0;
-      forEachObjectKey(obj, () => size++);
-      return size;
-  }
 
-  let loadingPromise;
-  let isLoading = false;
-  function loadScript(options, PromisePonyfill) {
-      if (!(options instanceof Object)) {
-          throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");
-      }
+  /**
+   * Load the Paypal JS SDK script asynchronously.
+   *
+   * @param {Object} options - used to configure query parameters and data attributes for the JS SDK.
+   * @param {PromiseConstructor} [PromisePonyfill=window.Promise] - optional Promise Constructor ponyfill.
+   * @return {Promise<Object>} paypalObject - reference to the global window PayPal object.
+   */
+  function loadScript$1(options, PromisePonyfill) {
+      validateArguments(options, PromisePonyfill);
       if (typeof PromisePonyfill === "undefined") {
-          // default to using window.Promise as the Promise implementation
-          if (typeof Promise === "undefined") {
-              throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");
-          }
-          PromisePonyfill = Promise;
+          PromisePonyfill = getDefaultPromiseImplementation();
       }
-      // resolve with the existing promise when the script is loading
-      if (isLoading)
-          return loadingPromise;
-      return (loadingPromise = new PromisePonyfill((resolve, reject) => {
+      return new PromisePonyfill((resolve, reject) => {
           // resolve with null when running in Node
@@ -447,6 +467,8 @@ if (typeof window === "undefined")
           const { url, dataAttributes } = processOptions(options);
-          // resolve with the existing global paypal object when a script with the same src already exists
-          if (findScript(url, dataAttributes) && window.paypal)
-              return resolve(window.paypal);
-          isLoading = true;
+          const namespace = dataAttributes["data-namespace"] || "paypal";
+          const existingWindowNamespace = getPayPalWindowNamespace(namespace);
+          // resolve with the existing global paypal namespace when a script with the same params already exists
+          if (findScript(url, dataAttributes) && existingWindowNamespace) {
+              return resolve(existingWindowNamespace);
+          }
           insertScriptElement({
@@ -456,22 +478,42 @@ url,
               onSuccess: () => {
-                  isLoading = false;
-                  if (window.paypal)
-                      return resolve(window.paypal);
-                  return reject(new Error("The window.paypal global variable is not available."));
+                  const newWindowNamespace = getPayPalWindowNamespace(namespace);
+                  if (newWindowNamespace)
+                      return resolve(newWindowNamespace);
+                  return reject(new Error(`The window.${namespace} global variable is not available.`));
               },
               onError: () => {
-                  isLoading = false;
                   return reject(new Error(`The script "${url}" didn't load correctly.`));
               },
           });
-      }));
+      });
   }
+  function validateArguments(options, PromisePonyfill) {
+      if (typeof options !== "object" || options === null) {
+          throw new Error("Invalid arguments. Expected options to be an object.");
+      }
+      if (typeof PromisePonyfill === "undefined") {
+          return;
+      }
+      if (typeof PromisePonyfill !== "function") {
+          throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.");
+      }
+  }
+  function getDefaultPromiseImplementation() {
+      if (typeof Promise === "undefined") {
+          throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");
+      }
+      return Promise;
+  }
+  function getPayPalWindowNamespace(namespace) {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      return window[namespace];
+  }
 
-  function loadScript$1(options) {
-      return loadScript(options, Promise$1);
+  function loadScript(options) {
+      return loadScript$1(options, Promise$1);
   }
   // replaced with the package.json version at build time
-  const version = "2.1.9";
+  const version = "3.0.0";
 
-  exports.loadScript = loadScript$1;
+  exports.loadScript = loadScript;
   exports.version = version;
@@ -478,0 +520,0 @@

dist/paypal.legacy.browser.min.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -17,2 +17,2 @@ *
  */
-var paypalLoadScript=function(t){"use strict";var e=setTimeout;function n(t){return Boolean(t&&void 0!==t.length)}function r(){}function o(t){if(!(this instanceof o))throw new TypeError("Promises must be constructed via new");if("function"!=typeof t)throw new TypeError("not a function");this._state=0,this._handled=!1,this._value=void 0,this._deferreds=[],l(t,this)}function i(t,e){for(;3===t._state;)t=t._value;0!==t._state?(t._handled=!0,o._immediateFn((function(){var n=1===t._state?e.onFulfilled:e.onRejected;if(null!==n){var r;try{r=n(t._value)}catch(t){return void u(e.promise,t)}a(e.promise,r)}else(1===t._state?a:u)(e.promise,t._value)}))):t._deferreds.push(e)}function a(t,e){try{if(e===t)throw new TypeError("A promise cannot be resolved with itself.");if(e&&("object"==typeof e||"function"==typeof e)){var n=e.then;if(e instanceof o)return t._state=3,t._value=e,void c(t);if("function"==typeof n)return void l((r=n,i=e,function(){r.apply(i,arguments)}),t)}t._state=1,t._value=e,c(t)}catch(e){u(t,e)}var r,i}function u(t,e){t._state=2,t._value=e,c(t)}function c(t){2===t._state&&0===t._deferreds.length&&o._immediateFn((function(){t._handled||o._unhandledRejectionFn(t._value)}));for(var e=0,n=t._deferreds.length;e<n;e++)i(t,t._deferreds[e]);t._deferreds=null}function s(t,e,n){this.onFulfilled="function"==typeof t?t:null,this.onRejected="function"==typeof e?e:null,this.promise=n}function l(t,e){var n=!1;try{t((function(t){n||(n=!0,a(e,t))}),(function(t){n||(n=!0,u(e,t))}))}catch(t){if(n)return;n=!0,u(e,t)}}function f(t){let e="";return p(t,(n=>{0!==e.length&&(e+="&"),e+=n+"="+t[n]})),e}function d(t,e={}){const n=document.createElement("script");return n.src=t,p(e,(t=>{n.setAttribute(t,e[t]),"data-csp-nonce"===t&&n.setAttribute("nonce",e["data-csp-nonce"])})),n}function p(t,e){for(const n in t)Object.prototype.hasOwnProperty.call(t,n)&&e(n)}function h(t){let e=0;return p(t,(()=>e++)),e}let y;o.prototype.catch=function(t){return this.then(null,t)},o.prototype.then=function(t,e){var n=new this.constructor(r);return i(this,new s(t,e,n)),n},o.prototype.finally=function(t){var e=this.constructor;return this.then((function(n){return e.resolve(t()).then((function(){return n}))}),(function(n){return e.resolve(t()).then((function(){return e.reject(n)}))}))},o.all=function(t){return new o((function(e,r){if(!n(t))return r(new TypeError("Promise.all accepts an array"));var o=Array.prototype.slice.call(t);if(0===o.length)return e([]);var i=o.length;function a(t,n){try{if(n&&("object"==typeof n||"function"==typeof n)){var u=n.then;if("function"==typeof u)return void u.call(n,(function(e){a(t,e)}),r)}o[t]=n,0==--i&&e(o)}catch(t){r(t)}}for(var u=0;u<o.length;u++)a(u,o[u])}))},o.allSettled=function(t){return new this((function(e,n){if(!t||void 0===t.length)return n(new TypeError(typeof t+" "+t+" is not iterable(cannot read property Symbol(Symbol.iterator))"));var r=Array.prototype.slice.call(t);if(0===r.length)return e([]);var o=r.length;function i(t,n){if(n&&("object"==typeof n||"function"==typeof n)){var a=n.then;if("function"==typeof a)return void a.call(n,(function(e){i(t,e)}),(function(n){r[t]={status:"rejected",reason:n},0==--o&&e(r)}))}r[t]={status:"fulfilled",value:n},0==--o&&e(r)}for(var a=0;a<r.length;a++)i(a,r[a])}))},o.resolve=function(t){return t&&"object"==typeof t&&t.constructor===o?t:new o((function(e){e(t)}))},o.reject=function(t){return new o((function(e,n){n(t)}))},o.race=function(t){return new o((function(e,r){if(!n(t))return r(new TypeError("Promise.race accepts an array"));for(var i=0,a=t.length;i<a;i++)o.resolve(t[i]).then(e,r)}))},o._immediateFn="function"==typeof setImmediate&&function(t){setImmediate(t)}||function(t){e(t,0)},o._unhandledRejectionFn=function(t){"undefined"!=typeof console&&console&&console.warn("Possible Unhandled Promise Rejection:",t)};let v=!1;function w(t,e){if(!(t instanceof Object))throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");if(void 0===e){if("undefined"==typeof Promise)throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");e=Promise}return v?y:y=new e(((e,n)=>{if("undefined"==typeof window)return e(null);const{url:r,dataAttributes:o}=function(t){let e="https://www.paypal.com/sdk/js";t.sdkBaseURL&&(e=t.sdkBaseURL,delete t.sdkBaseURL);const n={queryParams:{},dataAttributes:{}};p(t,(e=>{const r="data-"===e.substring(0,5)?"dataAttributes":"queryParams";n[r][e]=t[e].toString()}));const{queryParams:r,dataAttributes:o}=n;return{url:`${e}?${f(r)}`,dataAttributes:o}}(t);if(function(t,e){const n=document.querySelector(`script[src="${t}"]`);if(null===n)return null;const r=d(t,e);if(h(n.dataset)!==h(r.dataset))return null;let o=!0;return p(n.dataset,(t=>{n.dataset[t]!==r.dataset[t]&&(o=!1)})),o?n:null}(r,o)&&window.paypal)return e(window.paypal);v=!0,function({url:t,dataAttributes:e,onSuccess:n,onError:r}){const o=d(t,e);o.onerror=r,o.onload=n,document.head.insertBefore(o,document.head.firstElementChild)}({url:r,dataAttributes:o,onSuccess:()=>(v=!1,window.paypal?e(window.paypal):n(new Error("The window.paypal global variable is not available."))),onError:()=>(v=!1,n(new Error(`The script "${r}" didn't load correctly.`)))})}))}return t.loadScript=function(t){return w(t,o)},t.version="2.1.9",Object.defineProperty(t,"__esModule",{value:!0}),t}({});paypalLoadScript=paypalLoadScript.loadScript;
+var paypalLoadScript=function(t){"use strict";var e=setTimeout;function n(t){return Boolean(t&&void 0!==t.length)}function r(){}function o(t){if(!(this instanceof o))throw new TypeError("Promises must be constructed via new");if("function"!=typeof t)throw new TypeError("not a function");this._state=0,this._handled=!1,this._value=void 0,this._deferreds=[],f(t,this)}function i(t,e){for(;3===t._state;)t=t._value;0!==t._state?(t._handled=!0,o._immediateFn((function(){var n=1===t._state?e.onFulfilled:e.onRejected;if(null!==n){var r;try{r=n(t._value)}catch(t){return void u(e.promise,t)}a(e.promise,r)}else(1===t._state?a:u)(e.promise,t._value)}))):t._deferreds.push(e)}function a(t,e){try{if(e===t)throw new TypeError("A promise cannot be resolved with itself.");if(e&&("object"==typeof e||"function"==typeof e)){var n=e.then;if(e instanceof o)return t._state=3,t._value=e,void c(t);if("function"==typeof n)return void f((r=n,i=e,function(){r.apply(i,arguments)}),t)}t._state=1,t._value=e,c(t)}catch(e){u(t,e)}var r,i}function u(t,e){t._state=2,t._value=e,c(t)}function c(t){2===t._state&&0===t._deferreds.length&&o._immediateFn((function(){t._handled||o._unhandledRejectionFn(t._value)}));for(var e=0,n=t._deferreds.length;e<n;e++)i(t,t._deferreds[e]);t._deferreds=null}function s(t,e,n){this.onFulfilled="function"==typeof t?t:null,this.onRejected="function"==typeof e?e:null,this.promise=n}function f(t,e){var n=!1;try{t((function(t){n||(n=!0,a(e,t))}),(function(t){n||(n=!0,u(e,t))}))}catch(t){if(n)return;n=!0,u(e,t)}}function l(t){let e="https://www.paypal.com/sdk/js";t.sdkBaseURL&&(e=t.sdkBaseURL,delete t.sdkBaseURL);const n=function(t,e){let n="",r="";Array.isArray(t)?t.length>1?(n="*",r=t.toString()):n=t.toString():"string"==typeof t&&t.length>0?n=t:"string"==typeof e&&e.length>0&&(n="*",r=e);return{"merchant-id":n,"data-merchant-id":r}}(t["merchant-id"],t["data-merchant-id"]),r=Object.assign(t,n),{queryParams:o,dataAttributes:i}=Object.keys(r).filter((t=>void 0!==r[t]&&null!==r[t]&&""!==r[t])).reduce(((t,e)=>{const n=r[e].toString();return"data-"===e.substring(0,5)?t.dataAttributes[e]=n:t.queryParams[e]=n,t}),{queryParams:{},dataAttributes:{}});return{url:`${e}?${d(o)}`,dataAttributes:i}}function d(t){let e="";return Object.keys(t).forEach((n=>{0!==e.length&&(e+="&"),e+=n+"="+t[n]})),e}function p(t,e={}){const n=document.createElement("script");return n.src=t,Object.keys(e).forEach((t=>{n.setAttribute(t,e[t]),"data-csp-nonce"===t&&n.setAttribute("nonce",e["data-csp-nonce"])})),n}function h(t,e){return function(t,e){if("object"!=typeof t||null===t)throw new Error("Invalid arguments. Expected options to be an object.");if(void 0===e)return;if("function"!=typeof e)throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.")}(t,e),void 0===e&&(e=function(){if("undefined"==typeof Promise)throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");return Promise}()),new e(((e,n)=>{if("undefined"==typeof window)return e(null);const{url:r,dataAttributes:o}=l(t),i=o["data-namespace"]||"paypal",a=y(i);if(function(t,e){const n=document.querySelector(`script[src="${t}"]`);if(null===n)return null;const r=p(t,e);if(Object.keys(n.dataset).length!==Object.keys(r.dataset).length)return null;let o=!0;return Object.keys(n.dataset).forEach((t=>{n.dataset[t]!==r.dataset[t]&&(o=!1)})),o?n:null}(r,o)&&a)return e(a);!function({url:t,dataAttributes:e,onSuccess:n,onError:r}){const o=p(t,e);o.onerror=r,o.onload=n,document.head.insertBefore(o,document.head.firstElementChild)}({url:r,dataAttributes:o,onSuccess:()=>{const t=y(i);return t?e(t):n(new Error(`The window.${i} global variable is not available.`))},onError:()=>n(new Error(`The script "${r}" didn't load correctly.`))})}))}function y(t){return window[t]}o.prototype.catch=function(t){return this.then(null,t)},o.prototype.then=function(t,e){var n=new this.constructor(r);return i(this,new s(t,e,n)),n},o.prototype.finally=function(t){var e=this.constructor;return this.then((function(n){return e.resolve(t()).then((function(){return n}))}),(function(n){return e.resolve(t()).then((function(){return e.reject(n)}))}))},o.all=function(t){return new o((function(e,r){if(!n(t))return r(new TypeError("Promise.all accepts an array"));var o=Array.prototype.slice.call(t);if(0===o.length)return e([]);var i=o.length;function a(t,n){try{if(n&&("object"==typeof n||"function"==typeof n)){var u=n.then;if("function"==typeof u)return void u.call(n,(function(e){a(t,e)}),r)}o[t]=n,0==--i&&e(o)}catch(t){r(t)}}for(var u=0;u<o.length;u++)a(u,o[u])}))},o.allSettled=function(t){return new this((function(e,n){if(!t||void 0===t.length)return n(new TypeError(typeof t+" "+t+" is not iterable(cannot read property Symbol(Symbol.iterator))"));var r=Array.prototype.slice.call(t);if(0===r.length)return e([]);var o=r.length;function i(t,n){if(n&&("object"==typeof n||"function"==typeof n)){var a=n.then;if("function"==typeof a)return void a.call(n,(function(e){i(t,e)}),(function(n){r[t]={status:"rejected",reason:n},0==--o&&e(r)}))}r[t]={status:"fulfilled",value:n},0==--o&&e(r)}for(var a=0;a<r.length;a++)i(a,r[a])}))},o.resolve=function(t){return t&&"object"==typeof t&&t.constructor===o?t:new o((function(e){e(t)}))},o.reject=function(t){return new o((function(e,n){n(t)}))},o.race=function(t){return new o((function(e,r){if(!n(t))return r(new TypeError("Promise.race accepts an array"));for(var i=0,a=t.length;i<a;i++)o.resolve(t[i]).then(e,r)}))},o._immediateFn="function"==typeof setImmediate&&function(t){setImmediate(t)}||function(t){e(t,0)},o._unhandledRejectionFn=function(t){"undefined"!=typeof console&&console&&console.warn("Possible Unhandled Promise Rejection:",t)};return t.loadScript=function(t){return h(t,o)},t.version="3.0.0",Object.defineProperty(t,"__esModule",{value:!0}),t}({});paypalLoadScript=paypalLoadScript.loadScript;

dist/paypal.node.js

 /*!
- * paypal-js v2.1.9 (2021-02-15T22:49:36.078Z)
+ * paypal-js v3.0.0 (2021-03-01T22:43:43.710Z)
  * Copyright 2020-present, PayPal, Inc. All rights reserved.
@@ -26,3 +26,3 @@ *
 
-  if (objectSize(currentScript.dataset) !== objectSize(nextScript.dataset)) {
+  if (Object.keys(currentScript.dataset).length !== Object.keys(nextScript.dataset).length) {
     return null;
@@ -33,3 +33,3 @@ }
 
-  forEachObjectKey(currentScript.dataset, function (key) {
+  Object.keys(currentScript.dataset).forEach(function (key) {
     if (currentScript.dataset[key] !== nextScript.dataset[key]) {
@@ -59,13 +59,24 @@ isExactMatch = false;
 
-  var processedOptions = {
+  var processedMerchantIDAttributes = processMerchantID(options["merchant-id"], options["data-merchant-id"]);
+  var newOptions = Object.assign(options, processedMerchantIDAttributes);
+
+  var _Object$keys$filter$r = Object.keys(newOptions).filter(function (key) {
+    return typeof newOptions[key] !== "undefined" && newOptions[key] !== null && newOptions[key] !== "";
+  }).reduce(function (accumulator, key) {
+    var value = newOptions[key].toString();
+
+    if (key.substring(0, 5) === "data-") {
+      accumulator.dataAttributes[key] = value;
+    } else {
+      accumulator.queryParams[key] = value;
+    }
+
+    return accumulator;
+  }, {
     queryParams: {},
     dataAttributes: {}
-  };
-  forEachObjectKey(options, function (key) {
-    var keyType = key.substring(0, 5) === "data-" ? "dataAttributes" : "queryParams"; // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  }),
+      queryParams = _Object$keys$filter$r.queryParams,
+      dataAttributes = _Object$keys$filter$r.dataAttributes;
 
-    processedOptions[keyType][key] = options[key].toString();
-  });
-  var queryParams = processedOptions.queryParams,
-      dataAttributes = processedOptions.dataAttributes;
   return {
@@ -78,3 +89,3 @@ url: "".concat(sdkBaseURL, "?").concat(objectToQueryString(queryParams)),
   var queryString = "";
-  forEachObjectKey(params, function (key) {
+  Object.keys(params).forEach(function (key) {
     if (queryString.length !== 0) queryString += "&";
@@ -90,3 +101,3 @@ queryString += key + "=" + params[key];
   newScript.src = url;
-  forEachObjectKey(dataAttributes, function (key) {
+  Object.keys(dataAttributes).forEach(function (key) {
     newScript.setAttribute(key, dataAttributes[key]);
@@ -99,40 +110,44 @@
   return newScript;
-} // uses es3 to avoid requiring polyfills for Array.prototype.forEach and Object.keys
+}
 
+function processMerchantID(merchantID, dataMerchantID) {
+  var newMerchantID = "";
+  var newDataMerchantID = "";
 
-function forEachObjectKey(obj, callback) {
-  for (var key in obj) {
-    if (Object.prototype.hasOwnProperty.call(obj, key)) {
-      callback(key);
+  if (Array.isArray(merchantID)) {
+    if (merchantID.length > 1) {
+      newMerchantID = "*";
+      newDataMerchantID = merchantID.toString();
+    } else {
+      newMerchantID = merchantID.toString();
     }
+  } else if (typeof merchantID === "string" && merchantID.length > 0) {
+    newMerchantID = merchantID;
+  } else if (typeof dataMerchantID === "string" && dataMerchantID.length > 0) {
+    newMerchantID = "*";
+    newDataMerchantID = dataMerchantID;
   }
-}
 
-function objectSize(obj) {
-  var size = 0;
-  forEachObjectKey(obj, function () {
-    return size++;
-  });
-  return size;
+  return {
+    "merchant-id": newMerchantID,
+    "data-merchant-id": newDataMerchantID
+  };
 }
 
-var loadingPromise;
-var isLoading = false;
+/**
+ * Load the Paypal JS SDK script asynchronously.
+ *
+ * @param {Object} options - used to configure query parameters and data attributes for the JS SDK.
+ * @param {PromiseConstructor} [PromisePonyfill=window.Promise] - optional Promise Constructor ponyfill.
+ * @return {Promise<Object>} paypalObject - reference to the global window PayPal object.
+ */
+
 function loadScript(options, PromisePonyfill) {
-  if (!(options instanceof Object)) {
-    throw new Error("Invalid arguments. Expected an object to be passed into loadScript().");
-  }
+  validateArguments(options, PromisePonyfill);
 
   if (typeof PromisePonyfill === "undefined") {
-    // default to using window.Promise as the Promise implementation
-    if (typeof Promise === "undefined") {
-      throw new Error("Failed to load the PayPal JS SDK script because Promise is undefined. To resolve the issue, use a Promise polyfill.");
-    }
+    PromisePonyfill = getDefaultPromiseImplementation();
+  }
 
-    PromisePonyfill = Promise;
-  } // resolve with the existing promise when the script is loading
-
-
-  if (isLoading) return loadingPromise;
-  return loadingPromise = new PromisePonyfill(function (resolve, reject) {
+  return new PromisePonyfill(function (resolve, reject) {
     // resolve with null when running in Node
@@ -143,7 +158,11 @@ if (typeof window === "undefined") return resolve(null);
         url = _processOptions.url,
-        dataAttributes = _processOptions.dataAttributes; // resolve with the existing global paypal object when a script with the same src already exists
+        dataAttributes = _processOptions.dataAttributes;
 
+    var namespace = dataAttributes["data-namespace"] || "paypal";
+    var existingWindowNamespace = getPayPalWindowNamespace(namespace); // resolve with the existing global paypal namespace when a script with the same params already exists
 
-    if (findScript(url, dataAttributes) && window.paypal) return resolve(window.paypal);
-    isLoading = true;
+    if (findScript(url, dataAttributes) && existingWindowNamespace) {
+      return resolve(existingWindowNamespace);
+    }
+
     insertScriptElement({
@@ -153,8 +172,7 @@ url: url,
       onSuccess: function onSuccess() {
-        isLoading = false;
-        if (window.paypal) return resolve(window.paypal);
-        return reject(new Error("The window.paypal global variable is not available."));
+        var newWindowNamespace = getPayPalWindowNamespace(namespace);
+        if (newWindowNamespace) return resolve(newWindowNamespace);
+        return reject(new Error("The window.".concat(namespace, " global variable is not available.")));
       },
       onError: function onError() {
-        isLoading = false;
         return reject(new Error("The script \"".concat(url, "\" didn't load correctly.")));
@@ -166,5 +184,32 @@ }
 
-var version = "2.1.9";
+function validateArguments(options, PromisePonyfill) {
+  if (typeof options !== "object" || options === null) {
+    throw new Error("Invalid arguments. Expected options to be an object.");
+  }
 
+  if (typeof PromisePonyfill === "undefined") {
+    return;
+  }
+
+  if (typeof PromisePonyfill !== "function") {
+    throw new Error("Invalid arguments. Expected PromisePolyfill to be a function.");
+  }
+}
+
+function getDefaultPromiseImplementation() {
+  if (typeof Promise === "undefined") {
+    throw new Error("Promise is undefined. To resolve the issue, use a Promise polyfill.");
+  }
+
+  return Promise;
+}
+
+function getPayPalWindowNamespace(namespace) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  return window[namespace];
+}
+
+var version = "3.0.0";
+
 exports.loadScript = loadScript;
 exports.version = version;

package.json

 {
     "name": "@paypal/paypal-js",
-    "version": "2.1.9",
+    "version": "3.0.0",
     "description": "Client-side loader for the PayPal JS SDK",
@@ -45,14 +45,14 @@ "main": "dist/paypal.node.js",
     "devDependencies": {
-        "@babel/core": "^7.12.16",
-        "@babel/preset-env": "^7.12.16",
-        "@babel/preset-typescript": "^7.12.16",
+        "@babel/core": "^7.13.8",
+        "@babel/preset-env": "^7.13.8",
+        "@babel/preset-typescript": "^7.13.0",
         "@rollup/plugin-babel": "^5.3.0",
         "@rollup/plugin-commonjs": "^17.1.0",
         "@rollup/plugin-node-resolve": "^11.2.0",
-        "@rollup/plugin-replace": "^2.3.4",
+        "@rollup/plugin-replace": "^2.4.1",
         "@rollup/plugin-typescript": "^8.2.0",
         "@types/jest": "^26.0.20",
         "@types/promise-polyfill": "^6.0.3",
-        "@typescript-eslint/eslint-plugin": "^4.15.0",
-        "@typescript-eslint/parser": "^4.15.0",
+        "@typescript-eslint/eslint-plugin": "^4.15.2",
+        "@typescript-eslint/parser": "^4.15.2",
         "babel-jest": "^26.6.3",
@@ -62,10 +62,10 @@ "eslint": "^7.20.0",
         "filesize": "^6.1.0",
-        "husky": "^5.0.9",
+        "husky": "^5.1.1",
         "jest": "^26.6.3",
         "jest-puppeteer": "^4.4.0",
         "lint-staged": "^10.5.4",
-        "pinst": "^2.1.4",
+        "pinst": "^2.1.6",
         "prettier": "2.2.1",
-        "puppeteer": "^7.1.0",
-        "rollup": "^2.39.0",
+        "puppeteer": "^8.0.0",
+        "rollup": "^2.40.0",
         "rollup-plugin-filesize": "^9.1.0",
@@ -72,0 +72,0 @@ "rollup-plugin-terser": "^7.0.2",

README.md

@@ -62,5 +62,9 @@ # paypal-js
 
-loadScript({ "client-id": "test" }).then((paypal) => {
-    paypal.Buttons().render("#your-container-element");
-});
+loadScript({ "client-id": "test" })
+    .then((paypal) => {
+        paypal.Buttons().render("#your-container-element");
+    })
+    .catch(err) => {
+        console.error("failed to load the PayPal JS SDK script", err);
+    });
 ```
@@ -110,2 +114,39 @@
 
+#### Merchant ID Array
+
+The `merchant-id` option accepts an array to simplify the implementation for Multi-Seller Payments. With this approach the caller doesn't have to worry about managing the two different merchant id values (`data-merchant-id` and `merchant-id`).
+
+**Here's an example with multiple `merchant-id` values:**
+
+```js
+loadScript({
+    "client-id": "YOUR_CLIENT_ID",
+    "merchant-id": ["123", "456", "789"],
+});
+```
+
+Which will load the following `<script>` and use `merchant-id=*` to properly configure the edge cache:
+
+```html
+<script
+    data-merchant-id="123,456,789"
+    src="https://www.paypal.com/sdk/js?client-id=YOUR_CLIENT_ID&merchant-id=*"
+></script>
+```
+
+**Here's an example with one `merchant-id` value:**
+
+```js
+loadScript({
+    "client-id": "YOUR_CLIENT_ID",
+    "merchant-id": ["123"],
+});
+```
+
+When there's only one, the merchant-id is passed in using the query string.
+
+```html
+<script src="https://www.paypal.com/sdk/js?client-id=YOUR_CLIENT_ID&merchant-id=123"></script>
+```
+
 #### sdkBaseURL
@@ -112,0 +153,0 @@

types/script-options.d.ts

 interface PayPalScriptQueryParameters {
     "client-id": string;
-    "merchant-id"?: string;
+    // loadScript() supports an array and will convert it
+    // to the correct merchant-id and data-merchant-id string values
+    "merchant-id"?: string[] | string;
     currency?: string;
@@ -25,2 +27,3 @@ intent?: string;
     "data-merchant-id"?: string;
+    "data-namespace"?: string;
 }
@@ -31,4 +34,5 @@
         PayPalScriptDataAttributes {
-    [key: string]: string | boolean | undefined;
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    [key: string]: any;
     sdkBaseURL?: string;
 }

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