This is what my current request looks like with jQuery's ajax() method: type: 'POST', url: 'https://api.cc.email/v3/contacts', beforeSend: function(request) { request.setRequestHeader('Authorization', 'Bearer {access_token}'); request.setRequestHeader('Postman-Token', 'akdslfjasf-adfkdf-42d-924-e9843168744'); request.setRequestHeader('Content-Type', 'application/json'); request.setRequestHeader('Accept', '*/*'); request.setRequestHeader('cache-control', 'no-cache'); }, data: { email_address: { address: 'sandman@gmail.com' } }, For the headers, I copied what was listed in the example at https://v3.developer.constantcontact.com/api_guide/email_campaign_create.html?_ga=2.235470849.1287467225.1575499253-1677486522.1575049201#example-post-request. For the "Postman-Token" header, I am using the "API Key" value associated with my registered app. From the sounds of it, it seems this isn't enough. I need to first hit an authorization server which should then return another token, but the article you linked to doesn't provide enough info on how to do this.
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