How to Connect to GetResponse Through the API
Important! - In case you are a GetResponse 360 user, there are some differences that you need to keep an eye on.
The application must redirect to the page in your custom domain, for example: https://custom-domain.getresponse360.com/oauth2_authorize.html
The token requests have to be sent to one of GetResponse API v3 endpoints (depending on your environment). The token requests have to include X-Domain header.
Also, the application has to be registered in a GetResponse 360 account within the same environment.