## POST /api/v2/shared-hosting/{accountId}/addons/storage

**Order hosting storage add-on**

Purchase a storage add-on tier for the shared-hosting account. Get `addonId` from the storage add-on list; the response returns invoice/order IDs and a billing URL for payment. Payment provider modules are not part of the public v2 contract; omit `paymentMethod` for the normal invoice flow or use `card` as a card-payment preference.

### Related Endpoints

- `GET /api/v2/shared-hosting/{accountId}/addons/storage`: List hosting storage add-ons
- `GET /api/v2/shared-hosting/{accountId}`: Get shared-hosting account
- `PATCH /api/v2/shared-hosting/{accountId}`: Rename shared-hosting account

### Headers

- `Accept`: application/json
- `Authorization`: Bearer YOUR_API_KEY
- Required API scope: `write:billing`
- `Content-Type`: application/json

### Parameters

- `accountId` (path, string, required): Public shared-hosting account ID. Get it from GET /api/v2/shared-hosting `data[].id`. Do not invent this value; use the exact ID returned by the referenced API response. Example: `acct_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Request Body

- `addonId` (string, optional) Example: `storage-10gb`
- `paymentMethod` (string, optional) Example: `card`
  Allowed values: card, invoice

### Request Examples

#### Purchase storage tier

```bash
curl -X POST "https://cloud.hostup.se/api/v2/shared-hosting/acct_01hxa3b4c5d6e7f8g9h0j1k2m3/addons/storage" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "addonId": "storage-10gb",
    "paymentMethod": "card"
  }'
```

```json
{
  "addonId": "storage-10gb",
  "paymentMethod": "card"
}
```

### Response Schema

- `invoiceId` (string,null, required) Example: `inv_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `orderId` (string,null, required) Example: `ord_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `redirectUrl` (string,null, required) Example: `/billing?invoice=inv_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Responses

#### 201 - Storage add-on order created.
```json
{
  "invoiceId": "inv_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "orderId": "ord_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "redirectUrl": "/billing?invoice=inv_01hxa3b4c5d6e7f8g9h0j1k2m3"
}
```

#### 400 - Invalid request. The response body is an RFC 7807 Problem Details document.
```json
{
  "type": "https://developer.hostup.se/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "detail": "The request body failed validation.",
  "code": "invalid_request",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "errors": [
    {
      "pointer": "/items/0/domainName",
      "detail": "`domainName` is required.",
      "code": "invalid_request"
    }
  ]
}
```

#### 401 - Unauthorized. Authentication is required.
```json
{
  "type": "https://developer.hostup.se/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "detail": "Authentication is required.",
  "code": "unauthorized",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 403 - Forbidden. The caller lacks a required scope or does not own the resource.
```json
{
  "type": "https://developer.hostup.se/errors/forbidden",
  "title": "Forbidden",
  "status": 403,
  "detail": "The caller lacks a required scope or does not own the resource.",
  "code": "forbidden",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 404 - Not found. The resource does not exist or is not owned by the caller.
```json
{
  "type": "https://developer.hostup.se/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "The requested resource could not be found.",
  "code": "not_found",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 429 - Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
```json
{
  "type": "https://developer.hostup.se/errors/rate_limit_exceeded",
  "title": "Too many requests",
  "status": 429,
  "detail": "Too many requests. Retry after the limit resets.",
  "code": "rate_limit_exceeded",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 500 - Internal error. Retry later or contact support if the issue persists.
```json
{
  "type": "https://developer.hostup.se/errors/internal_error",
  "title": "Internal server error",
  "status": 500,
  "detail": "An unexpected error occurred. Retry later or contact support if the issue persists.",
  "code": "internal_error",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```