SumUp review - too cheap to be valuable?

SumUp is probably the simplest low-cost card reader with mobile app for payments. But what can businesses expect in exchange for the low fees?
SumUp is probably the cheapest card reader service with mobile app, but what can you expect for the low fees?

Customer reviews: The SumUp Card Reader – Accepts All Forms of Card Payments: Debit, Credit, and Contactless

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Sumup - Card reader and App review - Caveman Reviews