Is it possible to specify an IP address for the callback domain of user authorization? August 14, 2024 10:17 No, it is not possible to specify an IP address. Please specify a domain. アカウントリンク / AccountLink Related articles Tell me how to handle the "EXPECTATION_FAILED(08100017)" error in User Account Link. Are there any restrictions by IP address when using PayPay's various APIs? What applications are required to connect to the production environment? When is an account link required? What happens when the PayPay Points API (/v2/cashback) is executed with insufficient merchant prepaid balance?