For the first time see such error, but unfortunately it is not under our control - it is coinbase issue. Will try to figure out why it happened, but payments before with coinbase were successful.
I made payment directly from my crypto wallet, so I also didn't understand why the coinbase Commerce page was still displaced in the background but the good news is when the Bitcoin transaction got confirmed later on, the premium service was activatedMaybe under account, you can add something to track payments including transaction ID for crypto or something like payment history.
The audience in the project is 80% from Ukraine/Russia, so I translated message in Russian - my fault 
At the start of the project, I try to help users understand how payment works, because someone needs help with this, so sometimes I am contacting them by email.
It's alright. All good now. At the start of the project, I try to help users understand how payment works, because someone needs help with this, so sometimes I am contacting them by email.