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. 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 are the application items required to connect to the production environment? How do I test Grant Points API errors cases? When is an account link required?