And finally, it's time to go live! All you need to do to push it live is to change that one value in your /includes/library.php file. Change this line:
All this does is direct your form to use the live PayPal online payment gateway, not the sandbox (developer) area. If ever you need to switch back to testing your form, you can just revert the value in this line again.
If necessary, change the $pp["business"] line in /includes/library.php to your real paypal address. Personally I always test with the actual business address, but that's just me.
And you're done!