sumup/sumup

Implement or modify SumUp payment integrations using Hosted Checkout, Card Widget, Checkouts API, saved cards, React Native Checkout, terminal SDKs, Tap to Pay, or Cloud API. Use for integration code and payment-flow reviews.

Choose a SumUp integration and credential model, or review its payment security. Use for Hosted Checkout vs Card Widget, reader SDK vs Cloud API, API key vs OAuth, and public vs secret key decisions.

Diagnose and fix failing SumUp payment integrations, including checkout errors, callback verification, widget mounting, merchant or currency mismatches, missing scopes, affiliate setup, and uncertain or duplicate payments. MCP connection setup belongs to sumup-mcp.

Configure, authenticate, troubleshoot, or use the SumUp MCP server at mcp.sumup.com. Use for MCP client setup, missing tools, OAuth connection failures, merchant account queries, and SumUp documentation resources.

Set up SumUp sandbox merchants, choose online test cards or terminal simulation amounts, test saved-card tokenization, and design or run payment-flow regression checks. Use for requested test setup, scenarios, or verification.

Upgrade SumUp server or mobile SDKs, migrate deprecated endpoints, and assess release compatibility. Use for dependency bumps or migrations involving @sumup/sdk, Go, Python, PHP, Java, Rust, .NET, reader SDKs, Tap to Pay, React Native, or Swift Checkout.