Please make sure that you generated Pairing code at https://bitpay.com/api-tokens and filled to Brivium - Credits Payment BitPay option.
I was also this case after members paid first transaction. And add-on can not be used anymore. How to fixed it? My BitPay account was verified all information.
@Joker Black I see that you doesn't have license for almost of our add-ons on your site. I'm regret to reject your request.