Pick the right SumUp integration path and apply security best practices. Use when deciding between Hosted Checkout, Card Widget, Checkouts API, mobile SDKs, terminal SDKs, or Cloud API; choosing API key vs OAuth vs restricted keys; or reviewing SumUp integration security.
Troubleshoot common SumUp integration failures. Use when SumUp HMAC signature checks fail, checkout sessions expire, scopes aren't activated, widget mount is blocked, affiliate keys don't match, or `checkout_reference` collides.
Use the SumUp MCP server (https://mcp.sumup.com/mcp) from Cursor, Claude Code, Codex, or any MCP-capable client. Use when the user mentions SumUp MCP, needs to wire mcp.sumup.com, or wants tool-based access to SumUp APIs.
Set up and run SumUp sandbox tests. Use when configuring a SumUp test merchant, picking test cards, triggering deliberate failure (`amount = 11`), or building a SumUp end-to-end test harness.
Guide for upgrading SumUp API versions and server/mobile SDKs (@sumup/sdk, sumup-go, sumup Python, PHP, Java, Rust, .NET, iOS Terminal, Android Reader, Swift Checkout, React Native). Use when bumping SumUp SDK versions or migrating off deprecated endpoints.
Implement SumUp checkout flows end-to-end. Use when writing or reviewing SumUp Checkouts API calls, Card Widget mounts, Hosted Checkout setup, recurring tokenization, Terminal SDK / Cloud API reader checkouts, or 3DS / webhook handling.