# SumUp References Index

> Prefer the latest SumUp docs first: `https://developer.sumup.com/llms.txt`
> LLM entrypoint for discovery: `https://developer.sumup.com/llms.txt`

Use these entrypoints (`README.md`) based on requested stack and flow.

## Server SDKs

- `references/nodejs/README.md`
- `references/go/README.md`
- `references/python/README.md`
- `references/java/README.md`
- `references/php/README.md`
- `references/rust/README.md`
- `references/dotnet/README.md`

## Terminal / Card-Present Integrations

- `references/android-reader-sdk/README.md`
- `references/ios-terminal-sdk/README.md`
- `references/android-tap-to-pay-sdk/README.md`
- `references/cloud-api/README.md`
- `references/payment-switch/README.md`

## Online / Card-Not-Present Integrations

- `references/online-testing/README.md`
- `references/checkout-widget/README.md`
- `references/swift-checkout-sdk/README.md`
- `references/react-native-sdk/README.md`
- `references/checkouts-api/README.md`
- `references/apm/README.md`
- `references/webhooks-3ds/README.md`

## General Flow

- `references/checkout-playbook.md`

## Reading Order

1. This file to choose the integration path.
2. Open exactly one target reference README for implementation details.
3. Use `references/webhooks-3ds/README.md` whenever async status confirmation is needed.

## See Also

- `references/checkout-playbook.md`
- `references/cloud-api/README.md`
- `references/online-testing/README.md`
- `references/checkout-widget/README.md`
- `references/checkouts-api/README.md`
- `references/webhooks-3ds/README.md`