Do you mean each user on the app platform needs to have an account on constantcontact for them to grant access to the platform for oAuth flow?
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I have an app where I want to create each user who signs up on the platform as a contact on the ConstantContact. I am looking to create contact from the backend NodeJS, without OAuth flow. But I haven't found any document for the REST API to create a contact with just API key and Secret key. Please advise or point to the document that helps me address the problem. Thanks
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