You didn’t set all requested field for oauth. the access token you set is the authorize endpoint. The access token should be: https://sandbox.app.checkbook.io/web/v1/auth/oauth/token
Didn’t find really informations abour user profile endpoint that will return email and id
So you may need to authenticate user using bubble and after use a manual authentication process to add the connection to API.
[Showcase] Manual OAuth2 Token Integration
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