verifySubscription
open fun verifySubscription(subscriptionId: String, listener: AppPurchase.SubscriptionVerificationListener)
Verifies a subscription with your backend server to get the expiry date. Requires setting a SubscriptionVerificationCallback via setSubscriptionVerificationCallback.
After verification, the expiry time will be stored in the PurchaseResult and can be retrieved via getSubscriptionExpiryTime.
Parameters
subscriptionId
The subscription product ID to verify.
listener
Callback for verification result.