go-iap

go-iap verifies the purchase receipt via AppStore, GooglePlayStore or Amazon AppStore.

Current API Documents:

• AppStore:
• AppStore Server API:
• GooglePlay:
• Amazon AppStore:
• Huawei HMS:

Installation

go get github.com/awa/go-iap/appstore
go get github.com/awa/go-iap/playstore
go get github.com/awa/go-iap/amazon
go get github.com/awa/go-iap/hms

Quick Start

In App Purchase (via App Store)

import(
    "github.com/awa/go-iap/appstore"
)

func main() {
	client := appstore.New()
	req := appstore.IAPRequest{
		ReceiptData: "your receipt data encoded by base64",
	}
	resp := &appstore.IAPResponse{}
	ctx := context.Background()
	err := client.Verify(ctx, req, resp)
}

Note: The verifyReceipt API has been deprecated as of 5 Jun 2023. Please use App Store Server API instead.

In App Billing (via GooglePlay)

import(
    "github.com/awa/go-iap/playstore"
)

func main() {
	// You need to prepare a public key for your Android app's in app billing
	// at https://console.developers.google.com.
	jsonKey, err := ioutil.ReadFile("jsonKey.json")
	if err != nil {
		log.Fatal(err)
	}

	client := playstore.New(jsonKey)
	ctx := context.Background()
	resp, err := client.VerifySubscription(ctx, "package", "subscriptionID", "purchaseToken")
}

In App Purchase (via Amazon App Store)

import(
    "github.com/awa/go-iap/amazon"
)

func main() {
	client := amazon.New("developerSecret")

	ctx := context.Background()
	resp, err := client.Verify(ctx, "userID", "receiptID")
}

In App Purchase (via Huawei Mobile Services)

import(
    "github.com/awa/go-iap/hms"
)

func main() {
	// If "orderSiteURL" and/or "subscriptionSiteURL" are empty,
	// they will be default to AppTouch German.
	// Please refer to https://developer.huawei.com/consumer/en/doc/HMSCore-References-V5/api-common-statement-0000001050986127-V5 for details.
	client := hms.New("clientID", "clientSecret", "orderSiteURL", "subscriptionSiteURL")
	ctx := context.Background()
	resp, err := client.VerifySubscription(ctx, "purchaseToken", "subscriptionID", 1)
}

In App Store Server API

Note

• The App Store Server API differentiates between a sandbox and a production environment based on the base URL:

  • Use https://api.storekit.itunes.apple.com/ for the production environment.
  • Use https://api.storekit-sandbox.itunes.apple.com/ for the sandbox environment.

• If you're unsure about the environment, follow these steps:

  • Initiate a call to the endpoint using the production URL. If the call is successful, the transaction identifier is associated with the production environment.
  • If you encounter an error code 4040010, indicating a TransactionIdNotFoundError, make a call to the endpoint using the sandbox URL.
  • If this call is successful, the transaction identifier is associated with the sandbox environment. If the call fails with the same error code, the transaction identifier doesn't exist in either environment.

• GetTransactionInfo

import(
	"github.com/awa/go-iap/appstore/api"
)

//  For generate key file and download it, please refer to https://developer.apple.com/documentation/appstoreserverapi/creating_api_keys_to_use_with_the_app_store_server_api
const ACCOUNTPRIVATEKEY = `
    -----BEGIN PRIVATE KEY-----
    FAKEACCOUNTKEYBASE64FORMAT
    -----END PRIVATE KEY-----
    `
func main() {
	c := &api.StoreConfig{
		KeyContent: []byte(ACCOUNTPRIVATEKEY),  // Loads a .p8 certificate
		KeyID:      "FAKEKEYID",                // Your private key ID from App Store Connect (Ex: 2X9R4HXF34)
		BundleID:   "fake.bundle.id",           // Your app’s bundle ID
		Issuer:     "xxxxx-xx-xx-xx-xxxxxxxxxx",// Your issuer ID from the Keys page in App Store Connect (Ex: "57246542-96fe-1a63-e053-0824d011072a")
		Sandbox:    false,                      // default is Production
	}
	transactionId := "FAKETRANSACTIONID"
	a := api.NewStoreClient(c)
	ctx := context.Background()
	response, err := a.GetTransactionInfo(ctx, transactionId)

	transantion, err := a.ParseSignedTransaction(response.SignedTransactionInfo)
	if err != nil {
	    // error handling
	}

	if transaction.TransactionId == transactionId {
		// the transaction is valid
	}
}

• GetTransactionHistory

import(
	"github.com/awa/go-iap/appstore/api"
)

//  For generate key file and download it, please refer to https://developer.apple.com/documentation/appstoreserverapi/creating_api_keys_to_use_with_the_app_store_server_api
const ACCOUNTPRIVATEKEY = `
    -----BEGIN PRIVATE KEY-----
    FAKEACCOUNTKEYBASE64FORMAT
    -----END PRIVATE KEY-----
    `
func main() {
	c := &api.StoreConfig{
		KeyContent: []byte(ACCOUNTPRIVATEKEY),  // Loads a .p8 certificate
		KeyID:      "FAKEKEYID",                // Your private key ID from App Store Connect (Ex: 2X9R4HXF34)
		BundleID:   "fake.bundle.id",           // Your app’s bundle ID
		Issuer:     "xxxxx-xx-xx-xx-xxxxxxxxxx",// Your issuer ID from App Store Connect (Users and Access > Integrations > In-App Purchase)(Ex: "57246542-96fe-1a63-e053-0824d011072a")
		Sandbox:    false,                      // default is Production
	}
	originalTransactionId := "FAKETRANSACTIONID"
	a := api.NewStoreClient(c)
	query := &url.Values{}
	query.Set("productType", "AUTO_RENEWABLE")
	query.Set("productType", "NON_CONSUMABLE")
	ctx := context.Background()
	responses, err := a.GetTransactionHistory(ctx, originalTransactionId, query)

	for _, response := range responses {
		transantions, err := a.ParseSignedTransactions(response.SignedTransactions)
	}
}

• Error handling
  • handler error per apple store server api error document
  • error definition

Parse Notification from App Store

import (
	"github.com/awa/go-iap/appstore"
	"github.com/golang-jwt/jwt/v4"
)

func main() {
	tokenStr := "SignedRenewalInfo Encode String" // or SignedTransactionInfo string
	token := jwt.Token{}
	client := appstore.New()
	err := client.ParseNotificationV2(tokenStr, &token)

	claims, ok := token.Claims.(jwt.MapClaims)
	for key, val := range claims {
		fmt.Printf("Key: %v, value: %v\n", key, val) // key value of SignedRenewalInfo
	}
}

ToDo

• Validator for In App Purchase Receipt (AppStore)
• Validator for Subscription token (GooglePlay)
• Validator for Purchase Product token (GooglePlay)
• More Tests

Support

In App Purchase

This validator supports the receipt type for iOS7 or above.

In App Billing

This validator uses Version 3 API.

In App Purchase (Amazon)

This validator uses RVS for IAP v2.0.

In App Purchase (HMS)

This validator uses Version 2 API.

In App Store Server API

This validator uses Version 1.0+

License

go-iap is licensed under the MIT.