![]() The x5c field of the JWS payload provided by Apple contained three certificates. ![]() In looking into the x5c field, I have found that RFC7515 contains a Base64-encoded X.509 certificate or chain, which can be used as a key for JWS. In addition, alg contains ES256, indicating that a public key using the ECDSA method is required. However, the only headers included in the signedPayload are alg and x5c. to publish the public key, and obtain the token using the kid field, etc. In the case of JWT, etc., it is common to use JWK (JSON Web Key), etc. However, if you read its documentation, you’ll find that Apple does not provide public keys. SignedPayload may seem like a normal JWS. We can just verify this, but the verification method had its own quirks that offered different challenges from OpenID Connect and other methods that often use JWT (JSON Web Tokens). ![]() Version 2 sends a JSON payload encoded with JWS (JSON Web Signature). ![]() Changes in Version 2Īpp Store Server Notifications Version 1 sent a JSON payload if a specified endpoint was set. Monster Strike was already using Version 1 for notifications, but with the likely increase in notification types supported in Version 2 and to release features that make use of App Store Server Notifications, we made the decision to jump to Version 2. With Apple’s release of StoreKit 2 in October 2021, server notifications received an update in the form of App Store Server Notifications Version 2. The official StoreKit documentation recommends receiving and acting on refund notifications. App Store Server Notifications notify the server of events such as refunds and subscription renewals of in-app purchases.
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