On digistore24.com, we allow our users to have multiple accounts. Whenever user connects a second account to constant contact, the connection of the first account is cut. The reason is, that the first refresh_token becomes invalid - see https://v3.developer.constantcontact.com/api_guide/server_flow.html#authorization-code-request We need to be able to retrieve a constant contact account id, so that we store it with the refresth token and know, which old refresh tokens to replace. How can we do this?
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