Server to server Authentication


Server to server Authentication

Hi everyone,

 I'm trying make my web server autheticate on the API to ad contact that my website might get over time. Does Anybody have a clue about how to do it. Is it even possible here ?

Thanks in advance for the attention.




If you are looking to be able to use our API in order to take actions such as adding contacts to your Constant Contact account, you will need authentication for your Constant Contact account to be able to do this. On our developer pages, we have a guide that specifically covers how to use authentication with our API and discusses the methods you can use. You can find that guide here:


Additionally, if you are simply looking for a method to occasionally sign up contacts who have filled out information on your website, we have a new feature of our signup forms that allows this process to be much simpler by simply POSTing contact data to a URL. You can read more about this new feature here:


If you have any questions or if I can provide additional info, please let me know!



Elijah G.
API Support Engineer
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