Thanks for being part of the community forum! Your approval is being reviewed by our product team. There's no set timeline on how long it takes for the product team to review the request, because the request is reviewed case by case. To setup the endpoint URL for the notification callback API. Go to configurations of the project that you have created. Click “Add Callback Configuration”. Then you will see the option to add the domain and the path.
Please refer to Getting Started with Visa Developer documentation provided below for callback URL information.