'U51' => 'Merchant is not "live"',
'U52' => 'Merchant not approved for transaction type (CC or EFT)',
'U53' => 'Transaction amount exceeds merchant\'s per transaction limit',
'U51' => 'Merchant is not "live"',
'U52' => 'Merchant not approved for transaction type (CC or EFT)',
'U53' => 'Transaction amount exceeds merchant\'s per transaction limit',