i'm developing the server side of an app with IAP, i know that i need to send the receipt from the app to my server when the user do a subscription, then validate the receipt with the app store for the status, date expiration, etc, & give the user the content.
But my question is, what receipt do i need to check for the renew status? i mean, the first time i check the receipt the app store give me back a receipt, status and a latest receipt, this latest receipt is the one that should i use to check the status the next time or should i use always the original receipt? i been testing with both of them and they give me the same status from the app store but i'm not sure of what is the correct way to doing.
Thanks