| -1 | Invalid input parameters | Invalid input parameters | Invalid input parameters | SoftPOS-mPOS |
| -10 | POS connection timeout | POS connection timeout | POS connection timeout | mPOS |
| -11 | | Transaction not reversible | | SoftPOS-mPOS |
| -12 | | | Accounting closure not performed | mPOS |
| -13 | Active developer options | | | SoftPOS |
| -14 | Network not available | | | SoftPOS-mPOS |
| -15 | Smartphone not connected to network | | | SoftPOS-mPOS |
| -16 | NFC not active | | | SoftPOS |
| -17 | No reversible SoftPOS transactions in the last month | | | SoftPOS |
| -18 | Last authorized transaction cannot be served (may already be reversed) | | | SoftPOS-mPOS |
| -19 | Transaction unavailable (only SoftPOS TID present and requires closing) | | | SoftPOS |
| -2 | Device not secure | Device not secure | Device not secure | SoftPOS-mPOS |
| -20 | NFC not available | | | SoftPOS |
| -21 | AutoClose and sendTicket cannot be requested together | | | SoftPOS-mPOS |
| -3 | Bluetooth off | Bluetooth off | Bluetooth off | mPOS |
| -30 | SoftPOS payment error (see softPosError param for details) | | | SoftPOS |
| -4 | Services not available | Services not available | Services not available | SoftPOS-mPOS |
| -5 | Deprecated app | Deprecated app | Deprecated app | SoftPOS-mPOS |
| -6 | Login required | Login required | Login required | SoftPOS-mPOS |
| -7 | TerminalId suspended | TerminalId suspended | TerminalId suspended | SoftPOS-mPOS |
| -8 | TerminalId absent | TerminalId absent | TerminalId absent | SoftPOS-mPOS |
| -9 | TerminalId not configured on POS | TerminalId not configured on POS | TerminalId not configured on POS | SoftPOS-mPOS |
| 0 | Transaction approved | Transaction approved | Accounting closure performed | SoftPOS-mPOS |
| 9 | POS not connected | POS not connected | POS not connected | mPOS |
| 10 | Transaction canceled - Occurs when the user cancel the payment via X button | Transaction canceled - Occurs when the user cancel the payment via X button | | SoftPOS iOS |
| 20 | Transaction canceled - Occurs when the user cancel the payment via X button or put the NexiPOS in background
| Transaction canceled - Occurs when the user cancel the payment via X button or put the NexiPOS in background | | SoftPOS-mPOS |
| 21 | Transaction denied by the HOST | Transaction denied by the HOST | | SoftPOS-mPOS |
| 22 | Transaction canceled - occurs when the timeout is reached (30 sec) or generic error | Transaction canceled - occurs when the timeout is reached (30 sec) or generic error | | SoftPOS-mPOS |
| 23 | Transaction canceled - Occurs when the user cancel the payment via X button in the PIN screen | | | SoftPOS iOS |
| 9 | POS not connected | POS not connected | POS not connected | mPOS |
|