what do i do with my api key?

[jennozkan]

I have good knowledge of HTML and CSS, and a little bit of knowledge and experience with PHP, and want to do some pretty simple customization of forms for my constant contact account. I found topics that seem to cover what I'm wanting to do. I will be creating and/or editing some php files somewhere, but the problem is that I don't know where those files are or where they will go. I got an API key for my app, but I have no clue what to do with it to connect to the API or to edit the php.

So, what do I do with my API key (very basic instructions, I know nothing about this), and where are the PHP files?

Thanks for any help

[DaveBerard]

We offer a sample php sign up form complete with a REST library you can use in other applications.  Please take a look at the sample code here.  This should help you get started, please let me know if there are any other questions once you take a look at that sample code.