Hello, like everything that works on the Internet, sometimes there may be technical problems when processing payments. That is why it is so important that the payment gateway provides high-quality technical support that can help you at any time. Typically, support is provided through several communication channels: chat, phone, email. By the way, I can recommend you to use Payadmit - one of the most popular and reliable payment gateways that provides the
Cryptocurrency Payments function.