iOS In-App Purchase Validation
Server-side validation of iOS in-app purchases confirms that a purchase is legitimate by sending transaction data to your server for verification. This step is optional, since the AppCoins SDK already validates purchases on the client.
For iOS integration, there is only one server validation option available: Remote Check. Remote Check involves sending transaction information to remote servers for validation.
Remote Check
Your server must be able to receive the necessary information from your application, send it to our server for validation, process the response from our server, and relay the appropriate result back to your application.
Documentation: