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.
Install
npx skills add sumup/sumup-skills --skill sumup-debugnpx skills add sumup/sumup-skills --skill sumup-debug -a claude-code -gnpx skills add sumup/sumup-skills --skill sumup-debug -a codex -ggemini skills install https://github.com/sumup/sumup-skills.git --path skills/sumup-debuggh skill install sumup/sumup-skills sumup-debuggit clone --depth 1 https://github.com/sumup/sumup-skills /tmp/sumup__sumup-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/sumup__sumup-skills/skills/sumup-debug ~/.claude/skills/sumup-debug # Claude Code
cp -R /tmp/sumup__sumup-skills/skills/sumup-debug ~/.agents/skills/sumup-debug # Codex, Cursor, Gemini CLI, Copilot, OpenCode