Is it possible to uniquely identify a user with userAuthorizationId? August 13, 2024 10:56 Yes, it is possible, because a userAuthorizationId is created for each clientId + PayPay user ID. Related articles If user's phone number has been changed, will userAuthorizationId also been changed? Can I use the PayPay app in a test environment? What happens when the PayPay Points API (/v2/cashback) is executed with insufficient merchant prepaid balance? When does the UAID status become "INACTIVE"? Tell me how to handle the "EXPECTATION_FAILED(08100017)" error in User Account Link.