If you’re integrating iDevAffiliate with direct PayPal buynow/subscription buttons and you’re buttons are located in a WordPress created page, you may need the following WordPress plugin. Why? The code being used in your iDevAffiliate compatible Paypal button uses a snippet of PHP code. By default, WordPress doesn’t allow PHP code to be used in your pages. The plugin at the link below will allow for PHP code to be used in your pages.
https://wordpress.org/extend/plugins/exec-php/
NOTE: There are many plugins that allow PHP code – this is just one example. Feel free to use any plugin you want.
Another option with reported success:
https://wordpress.org/plugins/insert-php/
Checking Your Button After The Plugin Is Installed
The following video walks you through the steps needed to make sure your button code is setup properly. This is not a professional video, just something we made on-the-fly for a customer.