Quick Reference Tables — VP3350
SDK Error Codes
| Code | Meaning | Action |
|---|---|---|
| E001 | Device not connected | Check BT, call connect() |
| E002 | Transaction timeout | Retry or re-present card |
| E003 | Card read error | Re-insert or try different card |
| E004 | Network timeout | Check internet, retry |
| E006 | Invalid API key | Verify in control panel |
| E007 | Firmware outdated | Call updateFirmware() |
Gateway Response Codes
| response | Meaning |
|---|---|
| 1 | Approved |
| 2 | Declined |
| 3 | Error |
See the VP3350 overview for the full topic list.