We use https://buy.itunes.apple.com/verifyReceipt to validate IAP receipts on our servers, and we're seeing a ton of errors with this endpoint today.
The error returned is
Http/1.1 Service UnavailableI filed a TSI (follow up #: 626779040) on this. We launched an update of our app this morning with significant press coverage. So now our new users are unable to purchase IAPs. 😟
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Andrew Ng
Founder & iOS, Priime