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Help creating Custom Connector with initial Access Token and Refresh Token

I am working with an API (documentation) that uses OAuth2 but does not have an initial authorization URL. Instead, I must retrieve the initial access token and refresh token by logging in to the admin portal and copying the generated tokens: 



The API provides a refresh token endpoint that can then be used to retrieve new tokens as needed.


Do Custom Connectors support this type of OAuth2 authentication? If so, please provide instructions on how to implement it.


These are my key roadblocks so far:


  • Custom Connector's OAuth2 configuration requires me to supply an authorization URL, which doesn't exist for this API
  • Custom Connector's OAuth2 configuration does not contain fields for me to supply initial access token and refresh token values
  • How do I set up the Custom Connector to automatically request a new token using the API's refresh token endpoint?

I have successfully built Custom Connectors before but am new to this API's particular authentication workflow and appreciate your help! 


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