> For the complete documentation index, see [llms.txt](https://paylater.gitbook.io/paylater-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://paylater.gitbook.io/paylater-docs/getting-started/quickstart.md).

# API GUIDE

The [PayLater ](https://paylaterapp.com/)API is your gateway to building custom, end-to-end BNPL experiences directly into your platform, mobile app, or checkout flow. Designed with flexibility and performance in mind, our RESTful APIs give you full control — from shopper onboarding and credit checks to transaction creation, refunds, and settlement reporting.

Whether you’re building a lightweight integration or a fully automated finance workflow, this section walks you through every step with clear endpoints, authentication guides, sample requests, and best practices.

### What You’ll Find Here:

OAuth 2.0 Client Credentials

* [Retrieve Your OAuth Credentials](/paylater-docs/getting-started/quickstart/get-access-token.md)

Process Transactions

* [Generate Payment Link](/paylater-docs/getting-started/quickstart/generate-payment-link.md)
* [Request to Pay (POS)](/paylater-docs/getting-started/quickstart/request-to-pay.md)
* [Check Order Status](/paylater-docs/getting-started/quickstart/check-payment-status.md)
* [Get Shopper Information](/paylater-docs/getting-started/quickstart/get-shopper-information.md)
* [Get Transaction by Order ID](/paylater-docs/getting-started/quickstart/get-transaction-by-order-id.md)
* [Get Transactions](/paylater-docs/getting-started/quickstart/get-transactions-list.md)
* [Refund](/paylater-docs/getting-started/quickstart/refund-api.md)
* [Partial Refund](/paylater-docs/getting-started/quickstart/partial-refund.md)
* [Webhook Intergration](/paylater-docs/getting-started/quickstart/webhook-integration.md)
* Error handling & response codes

Start integrating and unlock the power of [PayLater ](https://paylaterapp.com/)— where flexibility meets finance, one API call at a time.

## 🔐Authentication

All API requests must be authenticated using an `Authorization Bearer Token`. This key is issued to each merchant and must be included in all requests.\
\
To receive this Bearer Token use [Retrieve your OAuth Credentials](/paylater-docs/getting-started/quickstart/get-access-token.md) API.


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