Hello.
I'm trying to set up a payment structure where members are added by the administrator, then must pay a one-time fee to move from Level 1 to Level 2 members who have full access to the site.
I've followed all of the instructions to link the Paypal account, and was able to test the payment once, but now this is what I get when anyone tries to pay:
"This invoice has already been paid. For more information, please contact the merchant."
How do I correct this?