# sumup-testing

> Claude/Codex skill by [@sumup](https://omgskills.com/library/sumup/index.md) · 5 stars · Updated 2026-10-17

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.

Tags: agent-skills, ai, gemini-cli-extension, payments, sumup

## Install

```sh
git clone https://github.com/sumup/sumup-skills /tmp/sumup-skills && ln -s /tmp/sumup-skills/skills/sumup-testing ~/.claude/skills/sumup-testing
```

## From README

SumUp Sandbox Testing Guide Use this skill for test , scenario design, and verification of SumUp integrations. Test Environment Use a sandbox merchant account only. Confirm credentials map to sandbox environment. Prepare webhook endpoint in a non-production environment. Enable logging for checkout id, reference, status, and error code. Core Card Test Data Default values unless docs specify otherwise: CVV: any 3 digits (for example 123) Expiry: any future date (for example 12/30) Cardholder: any name Happy path cards: VISA 4200 0000 0000 0091 Mastercard 5200 0000 0000 0007 3DS challenge cards: VISA 4200 0000 0000 0042 Mastercard 5200 0000 0000 0015 Deliberate Failure Conventions For skill-level test recipes, use amount = 11 as the default forced-failure trigger. If an integration already uses canonical amount-based failures (for example 42.01, 42.76, 42.91), run both patterns and document which one is authoritative for that flow.

## Links

- HTML page: https://omgskills.com/library/sumup/sumup-skills/skills/sumup-testing/
- GitHub: https://github.com/sumup/sumup-skills
- Author: [@sumup](https://omgskills.com/library/sumup/index.md)

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