1
Reconnect OAuth
Settings → Reconnect → log in to SumUp → Allow. Fetches a fresh token. Resolves most connection issues.
2
Use the correct SumUp account
Log in with the account that owns the terminal. Other SumUp accounts cannot see the device.
3
Disconnect and start over
Settings → Disconnect → wait for confirmation → Connect with SumUp again → log in → Allow.
4
Clear browser cache
For persistent redirect issues: clear the cache (Ctrl+Shift+Delete or Cmd+Shift+Delete) and try again.
'OAuth failed' error message
'OAuth failed' error message
Server-side error. In 1–2 minutes try Connect with SumUp → Allow again. If it persists: support.
Connection was active, now shows 'Not connected'
Connection was active, now shows 'Not connected'
Token expired or revoked. Settings → Connect with SumUp or Reconnect → log in → Allow. There is no API-key path.
Payment works but reconciliation does not run
Payment works but reconciliation does not run
The OAuth connection is fine. App menu Transactions (title Transactions & Reconciliation) → Synchronize. Auto-sync lives on that same page (banner Automatic synchronisation active). Auto-match: card Auto-Assignment (POS) → Edit. Not Settings → Reconciliation.