# Billions

> Integrate Billions payments into your application or online store.

## Docs

- [Create an invoice](https://docs.billions.works/examples/create-an-invoice.md): Create a hosted payment invoice with an SDK.
- [Get invoices from the API](https://docs.billions.works/examples/get-invoices-from-api.md): Retrieve Billions invoices using your order reference.
- [Handle a callback](https://docs.billions.works/examples/handle-a-callback.md): Verify a payment callback against the authenticated API.
- [Introduction](https://docs.billions.works/index.md): Accept payments with Billions in your application or online store.
- [Callbacks and security](https://docs.billions.works/integration/callbacks-and-security.md): Process invoice notifications without trusting unverified input.
- [Go-live checklist](https://docs.billions.works/integration/go-live-checklist.md): Verify reliability and security before accepting production payments.
- [Integration overview](https://docs.billions.works/integration/overview.md): Understand the components and responsibilities in a Billions payment integration.
- [Payment flow](https://docs.billions.works/integration/payment-flow.md): Implement invoice creation, customer redirect, and payment confirmation.
- [Prerequisites](https://docs.billions.works/integration/prerequisites.md): Prepare credentials, endpoints, and order identifiers before coding.
- [SDK overview](https://docs.billions.works/sdks/overview.md): Choose an official SDK for your application.
- [PHP SDK](https://docs.billions.works/sdks/php.md): Install and use the official Billions PHP SDK.
- [TypeScript SDK](https://docs.billions.works/sdks/typescript.md): Install and use the official Billions TypeScript SDK.
- [Store integrations](https://docs.billions.works/store-integrations/overview.md): Connect Billions to supported ecommerce platforms.
- [WooCommerce](https://docs.billions.works/store-integrations/woocommerce.md): Install and configure the official Billions payment gateway for WooCommerce.