In App Purchase - Android Integration

Functions to sell and restore Google Play In-App Purchases from your app. The WebToNative In-App Purchase plugin wraps Google Play Billing natively, giving you a single JavaScript API to initiate a purchase (one-time or subscription) and query the purchases a user already owns.

You'll need to import the javascript file in your website before starting from this link.

If you have not set up In-App Purchase in your Google Developer account yet, see In-App Purchase Android Setup for how to configure IAP in Android.

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Initiate a Purchase

Starts the Google Play Billing purchase flow for the given product. On completion, the callback receives the purchase receipt, which you then verify with the Google Play Developer API.

Plain Javascript

window.WTN.inAppPurchase({
  productId: "Product Id of IAP",
  productType: "INAPP",
  isConsumable: true,
  accountToken: "11112222-3333-4444-5555-666677778888",
  callback: function (data) {
    if (data.isSuccess) {
      // Send data.receiptData to your server to verify the purchase.
      console.log(data.receiptData);
    }
  },
});

npm

Parameters:

Key	Type	Required	Description
productId	String	Yes	The product ID exactly as created in the Google Play Console.
productType	String	Yes	"INAPP" for one-time purchases, or "SUBS" for subscriptions.
isConsumable	Boolean	Yes	Whether the product can be purchased again. See the guidance below.
accountToken	String	No	A token that associates the purchase with a user in your system, for server-side reconciliation. See availability note below.
callback	Function	No	Callback function invoked with the response.

accountToken availability: The accountToken parameter went live on 09/06/26. It is only honored by Android builds generated on or after 09/06/26 — earlier builds ignore the field. Regenerate your build after this date to use it.

Choosing isConsumable:

Product	productType	isConsumable	Behavior
One-time consumable	"INAPP"	true	User can purchase the product again and again.
One-time non-consumable	"INAPP"	false	User can purchase the product only once.
Subscription	"SUBS"	false	Treated as a non-consumable product.

Callback Response:

Key	Type	Description
type	String	Always "inAppPurchase". Use this to filter the callback.
isSuccess	Boolean	true if the purchase completed successfully, false otherwise.
receiptData	Object	The purchase receipt. Send this to your server for verification.

Example response:

{
  "type": "inAppPurchase",
  "receiptData": { },
  "isSuccess": true
}

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Query Purchases

Returns all purchases the user currently owns — active subscriptions and non-consumed one-time purchases. Use this to restore purchases or re-verify entitlements.

Plain Javascript

window.WTN.getAllPurchases({
  callback: function (data) {
    if (data.isSuccess) {
      console.log(data.purchaseData);
    }
  },
});

npm

Parameters:

Key	Type	Required	Description
callback	Function	No	Callback function invoked with the response.

Callback Response:

Key	Type	Description
type	String	Always "purchaseList". Use this to filter the callback.
isSuccess	Boolean	true if the query completed successfully, false otherwise.
purchaseData	Array	The user's active subscriptions and non-consumed one-time purchases.

Example response:

{
  "type": "purchaseList",
  "isSuccess": true,
  "purchaseData": [{ }, { }]
}

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Official References

• Google Play Billing — Overview

• Verify purchases — Google Play Developer API

• Google Play Console