David, the crux of the original post and my post was that we're not working with users who are Constant Contact customers.  We have an input on our site that takes an e-mail and we want to add that e-mail to our account's contacts.     Nowhere in this flow will anyone log into Constant Contact and then grant our app access to their account.  I am not sure how you got back to this thread with the OAuth description that's posted on the docs after the previous posts.   I am able to get the flow I described working, but it requires me to manually log into my Constant Contact account every 2 hours (tokens last for 2 hours) to get a new token and then use that in my call.  Is there a way to get a permanent token so I don't have to do this?  Is there an engineer from the dev team that can explain how you guys have designed the system to handle this use case?   This is a very straightforward process if we're using one of the competitor services to Constant Contact.  Why is it so difficult with Constant Contact? ... View more

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. ... View more

I am looking to do the same thing.  The link you gave on how to setup authorization is very ambiguous.  For example, I am going through the client route (request to the API will be coming from JS).  The page says I need to send an authorization request, but where do you send this request to?  There is no URL referenced.  Also, when you try Googling anything related to Constant Contact's API, you get a bunch of links that reference the V2 build. ... View more