github.com/okeeffed/hello-world-stripe-api-golang-gin

Golang Gin Stripe Configuration

The original documentation comes from my documentation website here

This is a small "Hello, World!" to show a charge being made for Golang + Gin web server.

Resources

1. Go Docs Stripe
2. Stripe API
3. Stripe Testing Cards
4. Github Stripe Go Charge Testing
5. Gin Github
6. Golang Dotenv Github

Setting up

We need a few libs to get this all going. Run the following to fetch prerequisite packages:

# Gin server lib
go get -u github.com/gin-gonic/gin
# Stripe Go API
go get github.com/stripe/stripe-go
# Dotenv package for Golang
go get github.com/joho/godotenv

Setting up main.go

The Golang API (in my opinion) has some more complexity as opposed to others for setting up a basic charge.

Reading over their tests (like resource [4]) is the perfect way to see how to conform and adhere to the types -- particularly for our basic example.

package main

import (
        "log"
        "net/http"
        "os"

        "github.com/gin-gonic/gin"
        "github.com/joho/godotenv"
        "github.com/stripe/stripe-go"
        "github.com/stripe/stripe-go/charge"
)

// ChargeJSON incoming data for Stripe API
type ChargeJSON struct {
        Amount       int64  `json:"amount"`
        ReceiptEmail string `json:"receiptEmail"`
}

func main() {
  // load .env file
  err := godotenv.Load()
  if err != nil {
    log.Fatal("Error loading .env file")
  }

  // set up server
  r := gin.Default()

  // basic hello world GET route
  r.GET("/", func(c *gin.Context) {
    c.JSON(200, gin.H{
            "message": "Hello, World!",
    })
  })

  // our basic charge API route
  r.POST("/api/charge", func(c *gin.Context) {
    // we will bind our JSON body to the `json` var
    var json ChargeJSON
    c.BindJSON(&json)

    // Set Stripe API key
    apiKey := os.Getenv("SK_TEST_KEY")
    stripe.Key = apiKey

    // Attempt to make the charge.
    // We are setting the charge response to _
    // as we are not using it.
    _, err := charge.New(&stripe.ChargeParams{
      Amount:       stripe.Int64(json.Amount),
      Currency:     stripe.String(string(stripe.CurrencyUSD)),
      Source:       &stripe.SourceParams{Token: stripe.String("tok_visa")}, // this should come from clientside
      ReceiptEmail: stripe.String(json.ReceiptEmail)})

    if err != nil {
      // Handle any errors from attempt to charge
      c.String(http.StatusBadRequest, "Request failed")
      return
    }

    c.String(http.StatusCreated, "Successfully charged")
  })

  r.Run(":8080")
}

Making A Test Charge

We can run our server with the following:

go run main.go

In another terminal, run http POST http://localhost:8080/api/charge amount:=500 receiptEmail=[e-mail] (using HTTPie) and we will get back Successfully charged! Hooray! We made it.