# Payment API

- [Cancel payment API](https://portone.gitbook.io/docs-en/api/payment-api/cancel-payment-api.md)
- [Get payment API](https://portone.gitbook.io/docs-en/api/payment-api/get-payment-api.md)
- [Get payments API](https://portone.gitbook.io/docs-en/api/payment-api/get-payments-api.md)
- [Get payments by status API](https://portone.gitbook.io/docs-en/api/payment-api/get-payments-by-status-api.md)
- [Get payments by order ID, status (All)](https://portone.gitbook.io/docs-en/api/payment-api/get-payments-by-order-id-status-all.md)
- [Get payments by order ID, status (Top 1)](https://portone.gitbook.io/docs-en/api/payment-api/get-payments-by-order-id-status-top-1.md)
- [Get balance API (for split payment transaction)](https://portone.gitbook.io/docs-en/api/payment-api/get-balance-api-for-split-payment-transaction.md)
- [Get payments by billing key API](https://portone.gitbook.io/docs-en/api/payment-api/get-payments-by-billing-key-api.md)
- [Save payment amount API](https://portone.gitbook.io/docs-en/api/payment-api/save-payment-amount-api.md)
- [Update payment amount API](https://portone.gitbook.io/docs-en/api/payment-api/update-payment-amount-api.md)
- [Get payment amount API](https://portone.gitbook.io/docs-en/api/payment-api/get-payment-amount-api.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://portone.gitbook.io/docs-en/api/payment-api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.