active subscription + sign up for promotional offering

Hi 

Hey ​@lucksp, buying the web product with/without a promotional offer under the same App User ID does not extend the existing App Store subscription. It creates a second, separate subscription on the Web and the entitlement stays active until the later of the two expiration dates because these are two separate platforms with different payment providers. The periods run alongside each other, not stacked end-to-end on the Apple clock. So if this user was to purchase the web promo now while still prepaid for ~9.5 months on Apple, they typically double-pay for overlapping access to the same entitlement for that overlap window. RevenueCat won’t move the Apple expires_date forward because of the web purchase.

To try and get both purchases sequentially:

1. Best for an in-person promo without a second checkout:

   • Extend the existing Apple subscription with Apple’s Extend Subscription endpoint (adds days onto that Apple sub; max 90 days per call, 2 extensions/year): https://www.revenuecat.com/docs/guides/promotional-subscription-extensions#apple-app-store
   • Or grant a promotional entitlement with an end_time_ms past the Apple expiration (e.g. Apple expiry + promo length). This is a RC granting of an entitlement that runs alongside the store subscription — the granted entitlement will not cancel or convert billing: https://www.revenuecat.com/docs/api-v1#tag/entitlements/operation/grant-a-promotional-entitlement

2. If you want them to buy the web product, then I recommended waiting until the Apple sub has expired (or is about to), then show the web paywall. You can gate checkout on inactive entitlements so they don’t buy while still active, and you can check the status by querying the customerInfo for an entitlement 

Let me know if you have any questions!