Price of iphone in-app purchase, server-side

Question

How can a server determine the amount of an iphone in-app purchase ?

The server receives the purchase's receipt sent by the app and uses this to validate it.

This returns some informations like a transaction_id, product_id, etc; but no amount or user details.

Since the amount depends on the currency and the user's country, how can I get the amount of the purchase on the server ?

Answer 1

From the same document, you can get product details localized through the SKProduct class, check this

If you are asking about how do the server knows it, when you setup an in-app purchase on the server you choose the price as tier, each tier has the price in different currencies so when you send the in-app purchase product id in the request, it check its price you setup and reflects it in the corresponding currency.

For device locale, check this and for device language check this but to get it from the server itself, Apple doesn't provide an API for it.

Answer 2

Now it is possible to set a different price for each country so the mapping of in app purchase to a pricing tier can be cumbersome.

You can get the price as the user see it in the UI and the price locale from the client and then send that information to your server.

For renewals - You can see renewals by verifying the receipt data on the server side and use the price sent by the client in the first transaction.