This error occurs when you attempt to link the API with a program from an integration company other than the one selected when issuing the API key, or when the IP address entered in self-developed (direct input) is incorrect. Also, after modifying the integration information, the IP address that is reflected in the system. The same error may occur even if you call the API within a maximum of 30 minutes.
Please refer to the issuance guide link below and check whether the Integrator selected or the IP address information you entered is correct. Be sure to edit the linking information and try again after 30 minutes.
[API Key Issuance/Link Modification Guide]
[FORBIDDEN] Not allowed IP. If you need service access, please contact the Coupang seller call center. (Tel: +82-1600-9879, Email: *******@coupang.com)