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  1. App menu Transactions → Synchronize. 2. Check the SumUp connection: Settings → log in → Allow. SumUp sometimes provides payments only after 5–15 minutes.
Payments via the POS tile or Collect balance are usually linked automatically. Other SumUp payments stay open when amount or time is not a clear match — then link them yourself.
On Transactions, unlink and Link again.
App menu Transactions → card Auto-Assignment (POS) → Edit. Sensitivity: Aggressive, Recommended or Strict. Not Settings → Reconciliation.