How to validate Store Receipt for Apple Store and Google Play using Unity and PHP ?

Get Started

This tutorial will teach you how to validate Store receipt for Google Play and Apple Store using PHP and Unity.  You have to upload the PHP (verifyReceipt.php) to your server and set up the Unity plugin and add the following sample codes.

PHP code can be seen here.

Import Unity Prime31 Plugin

Import Prime31 plugins StoreKit for Apple Store and In-App-Billing for Google Play into Unity.

How to setup In-App-Purchase for IOS ?

There are two steps for this.

• Setup Item`s Product Id
• Setup Payment Success Event to Get Receipt

Setup Item`s Product Id

Open a demo scene in folder

  /Plugins/Prime31/Storekit/demo/StoreKitTestScene.

Edit StoreKitGUIManager.cs and modify Product Id.

 /Plugins/Prime31/Storekit/demo/ StoreKitGUIManager.cs

 // XXXX is the product Id, which must match what you have in iTunes.
 var productIdentifiers = new string[] { "XXXX" };
 StoreKitBinding.requestProductData( productIdentifiers );

Setup Payment Success Event to Get Receipt

The following function aims to capture the receipt from Apple when the payment becomes successful, and send the receipt to PHP to validate the receipt`s correctness.

Edit /Plugins/Prime31/Storekit/demo/ StoreKitEventListener.cs

void purchaseSuccessfulEvent( StoreKitTransaction transaction )
   {
       Debug.Log( "purchaseSuccessfulEvent: " + transaction );

       // Get iOS receipt 
       string receipt = transaction.base64EncodedTransactionReceipt;

       // Build POST form
       WWWForm form = new WWWForm ();
       form.AddField ("key", "1234");
       form.AddField ("receipt", receipt);
       form.AddField ("en", "prod") // dev, prod
       form.AddField ("os", "ios")  // ios, android

       // Server URL
       string url = "http://your server IP/verifyPayment.php";

       // Process respond
       StartCoroutine(this.DoWWW(new WWW(url, form), (www) => {
           Debug.Log("-------- Callback Success: " + www.text);
       }));
   }

How to setup In-App-Billing for Android ?

There are two steps for this.

• Setup App Public Key
• Setup Item`s Product Id
• Setup Payment Success Event to Get Receipt

Setup App Public Key

Open a demo scene in folder

/Plugins/ InAppBillingAndroid /demo/IABTestScene.unity

Setup Public key

Edit /Plugins/ InAppBillingAndroid /demo/ IABUIManager.cs

// Setup Public key 
var key = "Your Public Key on Google Play";

GoogleIAB.init( key );

Setup Item`s Product Id

Edit /Plugins/ InAppBillingAndroid /demo/ IABUIManager.cs

// Setup Product ID 
private string[] skus = new string[] 
{
    "XXXXXX"  //  your Product Id here 
};

GoogleIAB.queryInventory( skus );

Setup Payment Success Event to Get Receipt

Edit /Plugins/ InAppBillingAndroid /demo/ GoogleIABEventListener.cs


void purchaseCompleteAwaitingVerificationEvent( string purchaseData, string signature )
{
    Debug.Log( "purchaseCompleteAwaitingVerificationEvent. purchaseData: " + purchaseData + ", signature: " + signature );
    Prime31.Utils.logObject (purchaseData);
    Prime31.Utils.logObject (signature);

    // Google receipt 
    string receipt = purchaseData;

    // Initil POST form
    WWWForm form = new WWWForm ();
    form.AddField ("key", "1234");
    form.AddField ("os", "android");
    form.AddField ("en", "prod");
    form.AddField ("receipt", receipt);
    form.AddField ( "sing", signature);

    // Server URL
    string url = "http://your server ip/veryPayment.php";
    // Process respond
    StartCoroutine (this.DoWWW (new WWW (url, form), (www) => 
    {
        Debug.Log("-------- Callback Success: " + www.text);
    }));
}