Problem
The customer's payment fails and the reason given is "Blocked, first used." This usually means the bank or card issuer has blocked the transaction.
Solution
Understand that "Blocked, first used" means the bank or card issuer blocked the transaction.
Have the cardholder contact their bank or card issuer directly.
Wait for the bank or card issuer to resolve the blocking issue.
Retry the payment after the bank or card issuer clears the block.