---
title: "Post Billing Credits Checkout"
method: POST
path: "/v1/billing/credits/checkout"
tags: ["billing"]
---

# Post Billing Credits Checkout

`POST /v1/billing/credits/checkout`

## Request

- Base URL: `https://api.lithtrix.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://api.lithtrix.ai/v1/billing/credits/checkout`
- Auth: none declared

Start slider credit purchase via Airwallex PaymentIntent + Split Card Elements.

When Airwallex is not configured, returns **503** with honest volume-discount pricing.

## Headers

- `authorization` string, nullable

## Request body

- CreditsCheckoutRequest: Slider credit amount for volume-discount checkout (D173).
  - `credits` integer, required: Credit units to purchase (positive integer).

## Response `200`

Successful Response

- CreditsCheckoutLiveResponse: Airwallex slider checkout — Split Card Elements on billing page.
  - `billing_page_url` string, required
  - `intent_id` string, required
  - `client_secret` string, required
  - `currency` string, required
  - `amount` number, required
  - `customer_id` string, required
  - `credits` integer, required
  - `unit_rate_usd` string, required
  - `total_usd` string, required

## Other responses

- `422`: Validation Error
- `503`: Service Unavailable

---

[API](https://skmtc.dev/lithtrix/apis/lithtrix-api.md) · [All operations](https://skmtc.dev/lithtrix/apis/lithtrix-api/llms.txt) · [OpenAPI document](https://skmtc.dev/lithtrix/apis/lithtrix-api/revisions/be5de51bf4f8?raw)