I want to get an API key from my account and tie it to a wordpress plugin which can then be installed on any wordpress website.   The API key requires a redirectURI -- this URI is custom for every wordpress install:   http://mySite.com/wordpress/wp-content/plugins/mailsign/ctctResponseHandler.php http://yourSite.com/wp-content/plugins/mailsign/ctctResponseHandler.php   while I could generate that url and walk my users through generating their own API key with a custom redirect URL specific to their website, this is a _mess_.  I am confident that any instruction I could provide will at best be a hassle and at worst confuse all but technically savvy users.     I desire to make my plugin usable by novice users looking to add constant contact support to their website.   How can I setup a cross-domain API key without the need for custom-tailored redirect URIs? ... View more