Verify receipt for in Ios app purchase

Hello!
I want to verify consumable products on my server.

I created apple sandbox account and make test purchase.

Code (CSharp):

1.  
2. var wrapper = (Dictionary<string, object>)MiniJson.JsonDecode(args.purchasedProduct.receipt);
3.         if (wrapper != null)
4.         {
5.             string payload = (string)wrapper["Payload"];
6.             Debug.Log(payload);
7.           }
8.  

For some reason I got payload with spaces.

Then I checked my payload and got "status": 21002

I checked here https://www.revenuecat.com/app-store-receipt-validation#receipt-form-btn

Then I removed all spaces and checked again and got same error.

Where am I wrong? How can I get valid payload?

Code (CSharp):

1. 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Sorry, but it's don't clear for me.

I don't wanna parse or decode receipt.

I want to send my payload data to Apple
https://developer.apple.com/documentation/appstorereceipts/verifyreceipt

Based on Apple documentation I have to send base64 encoded receipt-data.

So my string payload is a base64 encoded string.
Should I send this string or do another way?

Now it's not working ( status: 21002).