This is probably an error generated due to how the client has set up his Paypal account but I wanted to run it by you to see if you could give me some direction to go in so I can tell him what to do.
When he clicks on the Paypal button in the cart this error message is coming up:
You do not have permissions to make this API call
Click here to go back
Any help on resolving this for him and advising to what he needs to do would be greatly appreciated.