User Profile

I'm testing the new Subscription Offers feature in iOS 12.2:https://developer.apple.com/app-store/subscriptions/#subscription-offersI have set up a Subscription Offer in App Store Connect, and the SKProduct property `discounts` contains this offer.I am generating a signature from the server according to:https://developer.apple.com/documentation/storekit/in-app_purchase/generating_a_signature_for_subscription_offersI have a test account which has purchased the original SKProduct, in order to be eligible for the offer.I'm also setting up a SKPayment with a SKPaymentDiscount correctly initialised with the signature return values.However, when attempting to purchase the offer the transaction fails with the following error:Error Domain=SKErrorDomain Code=12 "Cannot connect to iTunes Store" UserInfo={NSLocalizedDescription=Cannot connect to iTunes Store}Also, in the Console I can see an error for the process `itunesstored`:StoreKitClient: Buy failed with error: Error Domain=SSServerErrorDomain Code=3903 "Cannot connect to iTunes Store" UserInfo={NSLocalizedDescription=Cannot connect to iTunes Store} for payment: (entity: MicroPayment; id: 0xab06487fa50b06c0 ; data: )Does anyone know if this indicates an issue with the paramters on the client side, or is there an issue with this feature within StoreKit as this is in beta?

When calling this URL from our server, some requests are failing with 503:https://buy.itunes.apple.com/verifyReceipt> 503 Service Unavailable> The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.This is only happening to a small sample of our users, so my guess is that only some servers on Apple side are impacted...?