# Start a Stripe Checkout session

`POST /v1/me/billing/checkout-session`

URL: https://docs.spacerun.co/docs/platform/reference/billing/createCheckoutSession

- **Operation ID:** `createCheckoutSession`
- **Tags:** Billing
- **Base URL:** `http://localhost:8787`

Provide `productId` or `priceId`; the price and mode are resolved from the catalog (credit packs use one-off payment and accept `quantity`, plans use subscription with a single seat). Creates the Stripe customer on first use. Redirect the user to the returned `url`.

**Workflow:** [Integration guide](https://docs.spacerun.co/docs/platform/guides/billing-checkout).

**Authentication:** Platform user Bearer JWT. Acts only on the caller's own data.

## Authentication

- **Auth:** Platform user Bearer JWT (`Authorization: Bearer <access_token>`).

## Request body

Required: yes.

Content type: `application/json`

Schema: `object`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `productId` | `string<uuid>` | no | - |
| `priceId` | `string` | no | Min length: 1 |
| `successUrl` | `string<uri>` | yes | - |
| `cancelUrl` | `string<uri>` | yes | - |
| `quantity` | `integer` | no | Greater than: 0. Max: 99 |

**Example**

```json
{
  "priceId": "price_example",
  "successUrl": "https://portal.example.com/billing?checkout=success",
  "cancelUrl": "https://portal.example.com/billing?checkout=cancelled",
  "quantity": 1
}
```

## Responses

### 200

Checkout session.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `url` | `string \| null` | yes | Hosted Checkout URL to redirect the user to. |
| `id` | `string` | yes | Stripe Checkout session id. |

**Example**

```json
{
  "url": "https://checkout.stripe.com/example",
  "id": "cs_example"
}
```

## Errors

### 400

Request validation failed.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (ValidationErrorBody)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `success` | `boolean` | yes | One of: `false` |
| `error` | `object` | yes | - |
| `error.name` | `string` | yes | One of: `"ZodError"` |
| `error.issues` | `object[]` | yes | - |
| `error.issues[].code` | `string` | yes | - |
| `error.issues[].path` | `(string \| number)[]` | yes | - |
| `error.issues[].message` | `string` | yes | - |

**Request validation**

```json
{
  "success": false,
  "error": {
    "name": "ZodError",
    "issues": [
      {
        "code": "custom",
        "path": [
          "field"
        ],
        "message": "Invalid value"
      }
    ]
  }
}
```

### 401

Missing, malformed, expired or wrong-audience Bearer token (`missing_token`, `invalid_token`, `invalid_audience`).

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (ErrorBody)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | `string` | yes | Stable machine-readable error code, e.g. `forbidden`, `not_found`. |
| `details` | `any` | no | Optional structured context. For 403 it is `{ perm }`. |

**Error response**

```json
{
  "error": "missing_token"
}
```

### 404

`product`: no matching catalog product.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (ErrorBody)`, fields as described above.

**Error response**

```json
{
  "error": "product"
}
```

### 422

`price_mismatch` (priceId does not belong to productId) or `product_has_no_price`.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (ErrorBody)`, fields as described above.

**Error response**

```json
{
  "error": "price_mismatch"
}
```

### 500

Unexpected server error (`internal`). No details are returned.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (ErrorBody)`, fields as described above.

**Error response**

```json
{
  "error": "internal"
}
```

### 503

 Maintenance can refuse this write before authentication (degraded blocks session start and checkout; lockdown blocks other public/user writes).

- Header `x-request-id`: Request identifier; quote it when reporting an error.
- Header `Retry-After`: Maintenance retry delay in seconds; present for panic_mode. Example: `30`.
Content type: `application/json`

Schema: `object (MaintenanceErrorBody)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | `string` | yes | One of: `"panic_mode"` |
| `level` | `string` | yes | One of: `"degraded"`, `"lockdown"` |
| `reason` | `string \| null` | yes | - |

**Maintenance lockdown**

```json
{
  "error": "panic_mode",
  "level": "lockdown",
  "reason": "Scheduled maintenance"
}
```

## Examples

### curl

```bash
curl -X POST 'http://localhost:8787/v1/me/billing/checkout-session' \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H 'Content-Type: application/json' \
  --data '{"priceId":"price_example","successUrl":"https://portal.example.com/billing?checkout=success","cancelUrl":"https://portal.example.com/billing?checkout=cancelled","quantity":1}'
```

### TypeScript

```ts
const accessToken = process.env.ACCESS_TOKEN; // user JWT from your sign-in flow

const response = await fetch("http://localhost:8787/v1/me/billing/checkout-session", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${accessToken}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "priceId": "price_example",
    "successUrl": "https://portal.example.com/billing?checkout=success",
    "cancelUrl": "https://portal.example.com/billing?checkout=cancelled",
    "quantity": 1
  }),
});
if (!response.ok) throw new Error(`HTTP ${response.status}: ${await response.text()}`);
const data = response.status === 204 || response.status === 205
  ? undefined
  : response.headers.get("content-type")?.includes("json")
    ? await response.json()
    : await response.text();
```