Why was your SumUp Card transaction declined? Check out these common causes of card transaction failure and see what you can do to correct the issue.

Did your SumUp Mastercard decline? We can help! Check out these common causes of card transaction failure, and see what you can do to correct the issue.

SumUp Mastercard Unsuccessful Transactions - Help Center

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The SumUp Business Account gives you faster access to your money. Learn how to manage transfers, activate your SumUp Card and learn more about payment limits.

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SumUp Business Account

SumUp Mastercard* Unsuccessful Transactions

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SumUp Help Center | Understanding payments

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Understanding payments

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SumUp POS

Discover all you need to know about the SumUp Pro Card Reader. Learn how to set up your Pro Reader, accept payments and enable employee profiles and tipping.

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Pro Card Reader

Remote payments ensure there are lots of ways you can get paid with SumUp. From payment links to gift cards, learn how to securely take remote payments.

Remote Payments

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Remote payments

Keep your business running smoothly with details on how to start accepting payments and get paid with SumUp, from refunds and receipts to NFC and tipping.

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Accepting payments

SumUp helps you manage your business with a host of useful features on your profile. Easily add items to sell via SumUp profile and manage employee profiles.

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Business management

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Account setup

From setting up your SumUp Plus Card Reader to accepting payments and issuing receipts, here's everything you need to make the most of your Plus card reader.

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Plus Card Reader

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Lite Card Reader

Discover how to use the SumUp Solo Card Reader. From setting up your Solo to accepting and refunding payments, here's how to make your Solo work for you.

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Solo Card Reader

Kiosk is a SumUp POS add-on that provides self-service ordering and frees up staff time.

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Accept payments

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Get off to the best start with everything from a little help on which SumUp Card Reader is best for you to information on pricing, fees and delivery.

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Order & Pricing

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The SumUp POS Lite is a countertop point of sale system that pairs with your SumUp Card Reader so you can easily accept payment all in one place.

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POS Lite

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Security & Privacy

SumUp Connect is a loyalty system that brings more customers into your store with one powerful marketing program. 

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