We are developing an application that uses the IAP update model without updating. When testing the process of buying a subscription in the sandbox, we see two messages with the "buy" buttons.
The first message is displayed with product information: "Do you want to buy one subscription for $ xx.xx?"
After you click "buy for the first message", a second message appears (with a different buy button): "You have already purchased this subscription. Click" Buy "to renew or renew it."
Is this the usual iTunes / sandbox behavior for re-buying non-renewable subscribers after they have expired? Does iTunes require you to click the Buy button twice?
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