Coingate: In case of overpayment of your order, we do not receive the amount of the overpayment, so you need to follow the link yourself and create a request for a refund of your overpaid funds:

MixPay: with this payment provider the situation is the same as with Coingate. Please use this link to request a refund: Or just write to: 

NOWPayments: please contact our support team creating a support ticket so we can help you.

If you have overpaid for an order using another payment provider, please contact our customer support team by creating a support ticket.