---
title: "Create Checkout"
method: POST
path: "/api/billing/create-checkout"
tags: ["Billing"]
---

# Create Checkout

`POST /api/billing/create-checkout`

## Request

- Base URL: `https://api.soeru.biz` (the document declares no server; this is the origin it was published from)
- URL: `https://api.soeru.biz/api/billing/create-checkout`
- Auth: none declared. Required headers: `authorization`

Create a Stripe Checkout session for free → standard upgrade.

New model (2026-04): Only one paid plan (standard).
Subscription has 2 Stripe items:
  1. Base price: ¥980/month (recurring fixed)
  2. Metered price: per-message usage (tiered: ¥18 × 1-300, ¥15 × 301+)

## Headers

- `authorization` string, required: Bearer <token>

## Request body

- CheckoutRequest
  - `plan` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/soeru/apis/soeru-api.md) · [All operations](https://skmtc.dev/soeru/apis/soeru-api/llms.txt) · [OpenAPI document](https://skmtc.dev/soeru/apis/soeru-api/revisions/63f8d371abed?raw)