This grouping represents the App Registration API reference page.
It will use the Client ID and Secret that was added to the Postman API Reference Variables tab to authorize the creation and management of additional Custom Integrations.
Create Custom Integration uses the existing credentials to create an new integration. It processes the response and saves the new integration ID into an collection variable that is used by the other API requests in the group.
The response will include the Client ID and Secret for the new integration. These can be copied into the variables for the Access Token call to create a Bearer Token for those specific credentials.