Trouble with WP User Frontend Paypal

Hi, I am trying to charge for posts on my website. I have followed the instructions for setting this up via WP User Frontend – including entering my API credentials. However, whenever I test the payment using my personal paypal account as the ‘customer’s’ I receive a receipt from paypal, yet there is no payment into the business’ account. There is no money entering the account, nor is there any record of the transaction on either the ‘customer’s’ account nor the business’ account. I have contacted paypal and they are clueless as to the issue.

I am wondering if this is an issue with how I have set up the plugin? Alternatively, does anyone know a different way that I could do this?

Thanks