Hi Community i face an issue this days i click in customer account to Buy a refill 5 USD and i get this error from pay pal > PayPal Checkout - Please try again.
any one can help regards
It might be due to wrong configuration. Check below links and see it can help.
Refer:
Hi Dear thanks for the replay the issues its solved below the Problem its clearly Communication bee twin Pay pal and ASTPP ( I have disabled Pay Pal from ASTPP . I have noted that the amount was applied to customers account but not debited in me Pay Pal account 
) I’m working only wit Voucher its safer and third part Digital Solution company delivering the Voucher codes
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing: