Hi

We are using Unity In-App services. This returns a UnityEngine.Purchasing.Product when a product has been bought independently if it was for IOS or GooglePlay.

    public class Product

    {

        public bool availableToPurchase { get; }

        public ProductDefinition definition { get; }

        public bool hasReceipt { get; }

        public ProductMetadata metadata { get; }

        public string receipt { get; }

        public string transactionID { get; }

    }

For IOSBuyGoodsRequest we can just use the receipt. Why would we need an extra plugin in order to retrieve the correct parameters to send GooglePlayBuyGoodsRequest?

Shouldn't we just be able to use the receipt as well since Unity returns that for Googleplay?

Thanks

Helana

I find the documentation for GooglePlayBuyGoodsRequest very incomplete. You can use the receipt and avoid adding a plugin with some extra code, based on the documentation at https://docs.unity3d.com/Manual/UnityIAPPurchaseReceipts.html. The class below will get you INAPP_PURCHASE_DATA and INAPP_DATA_SIGNATURE:

class GooglePurchaseData {
	// INAPP_PURCHASE_DATA
	public string inAppPurchaseData;
	// INAPP_DATA_SIGNATURE
	public string inAppDataSignature;

	[System.Serializable]
	private struct GooglePurchaseReceipt {
		public string Payload;
	}
	[System.Serializable]
	private struct GooglePurchasePayload {
		public string json;
		public string signature;
	}

	public GooglePurchaseData(string receipt) {
		try {
			var purchaseReceipt = JsonUtility.FromJson<GooglePurchaseReceipt> (receipt);
			var purchasePayload = JsonUtility.FromJson<GooglePurchasePayload> (purchaseReceipt.Payload);
			inAppPurchaseData = purchasePayload.json;
			inAppDataSignature = purchasePayload.signature;
		} catch {
			Debug.Log("Could not parse receipt: " + receipt);
			inAppPurchaseData = "";
			inAppDataSignature = "";
		}
	}
}

 Here's a sample that you can put in ProcessPurchase:

GooglePurchaseData data = new GooglePurchaseData (args.purchasedProduct.receipt);
new GameSparks.Api.Requests.GooglePlayBuyGoodsRequest ()
	.SetSignature (data.inAppDataSignature)
	.SetSignedData (data.inAppPurchaseData)
	.Send ((response) => {
		if (!response.HasErrors) {
			Debug.Log("Successful purchase");
		} else {
			Debug.Log("Purchase error: " + response.Errors.JSON);
		}	
	});

Thank you Martin, that's just what I needed!

Hi all,

Thx for the answer,

Just a small question: When trying to use your sample, args in "GooglePurchaseData data = new GooglePurchaseData(args.purchasedProduct.receipt);" is underlined in red.

It seems not declared? I missed something?

Thx in advance for your answer,

Nico.

Hi Nico,

args refers to the argument passed to ProcessPurchase, see the Unity documentation here:

https://docs.unity3d.com/ScriptReference/Purchasing.IStoreListener.ProcessPurchase.html

Hope that helps,

Vicky

I tried the Martin's code but when I run it in the editor (as Android) it gives me the signature and the data both null. Should I run it on mobile?

Thanks Martin. It worked with Codeless IAP.

Thanks Martin for the code.

I used it but I get this error:

{"storeError":"java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException: Short read of DER length","verificationError":"2"}

I logged the inAppDataSignature and inAppPurchaseData and everything look OK.

I know "verificationError":"2 means The signature does not match the signed data. How can I fix this?

Thanks

Kaan