Optional
Which bank the account is at, for a provider serving several (the development bank): "BIDV", "ACB", "MB"… It decides the BIN the VietQR carries.
Pay2S: the Hook's token for this account (Pay2S → Webhooks, the key in the Token column).
Which bank the account is at, for a provider serving several (the development bank): "BIDV", "ACB", "MB"… It decides the BIN the VietQR carries.