@transferwise/approve-api-action-helpers

Approve api action helpers

A tiny library that lets you handle Strong Customer Authentication (SCA) required calls easily.

Read more from our API documentation.

Example

Sequence diagram of the flow

Usage

Installation

Using npm:

• npm install @transferwise/approve-api-action-helpers

Using CDN and script tags:

• <script src="https://unpkg.com/@transferwise/approve-api-action-helpers@latest/dist/main.js"></script>

Note that to use this library with Internet Explorer (11) fetch and Promise must be polyfilled. For example: https://polyfill-fastly.io/v3/polyfill.min.js?features=fetch%2CPromise. Comment out the script in the demo (demo/src/inex.html) to see it in action.

Consuming

This library exports a create function for SCA protected requests. It returns a request wrapper that can be used like a regular fetch request. Use it as follows:

import { create, Mode } from '@transferwise/approve-api-action-helpers';

const request = create({ mode: Mode.PRODUCTION });

const res = await request('https://my-backend-api.com/sca-protected-call', { method: 'GET', ... });

When the backend returns that SCA is required, it will run the user through an SCA flow and retry that request. Also, it will throw an error if you get a 4xx or 5xx response.

NB! make sure that your backend proxies 'x-2fa-approval' response header to the frontend and forwards it back to Wise when this library passes it back. Also please reflect the response status (403) back to the frontend.

Configuration options

key	optional	default	alternatives
mode	yes	Mode.PRODUCTION	Mode.SANDBOX

Demo

In /demo directory you'll find a simple demo of the flow.