Recently installed Typesetter without much problem.

I was wondering if there is a way to include an external script by way of:

 <?php require_once("/home/username/public_html/folder/externalscriptfile.php"); ?>
 <?php include("/home/username/public_html/folder/externalscriptfile.php"); ?>

I would like to use the external script to manage paid memberships on my site.

Thank you

Try to look into template.php in your theme