I am paying an invoice
Send exactly the amount shown, in the coin and network shown. The page tells you both; sending a different token or using a different network cannot be recovered automatically.
My payment is stuck on “waiting”. Detection and confirmation depend on the selected network and its current availability. Follow the confirmation progress on checkout. You can reopen the link to check status after the payment window ends.
I paid after the timer expired / sent a different amount. Your payment is recorded and routed to the merchant for review. Contact the merchant with the transaction hash from your wallet or block explorer; they can accept it, close the order, or refund it to an address you confirm.
Refunds. Refunds are sent to an address you confirm with the merchant — never automatically to the address you paid from, because exchange withdrawal addresses are often not yours.