## POST /api/v2/billing/cards

**Store saved card**

Store a tokenized card as the account payment card. Do not send raw card numbers to this API. Create `paymentMethodToken` with the supported client-side card tokenization flow, then POST it here. `makeDefault` is not accepted because the stored card automatically becomes the active card.

### Related Endpoints

- `GET /api/v2/billing/cards`: List saved cards
- `DELETE /api/v2/billing/cards/{id}`: Delete saved card
- `GET /api/v2/billing/activity`: List billing activity

### Headers

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

### Request Body

- `paymentMethodToken` (string, required) Example: `pm_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `last4` (string, optional) Example: `4242`
- `expMonth` (integer, optional) [min: 1, max: 12] Example: `12`
- `expYear` (integer, optional) [min: 2000, max: 9999] Example: `2028`
- `brand` (string, optional) Example: `visa`

### Request Examples

#### Store card token

```bash
curl -X POST "https://cloud.hostup.se/api/v2/billing/cards" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "paymentMethodToken": "pm_01hxa3b4c5d6e7f8g9h0j1k2m3",
    "last4": "4242",
    "expMonth": 12,
    "expYear": 2028,
    "brand": "visa"
  }'
```

```json
{
  "paymentMethodToken": "pm_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "last4": "4242",
  "expMonth": 12,
  "expYear": 2028,
  "brand": "visa"
}
```

### Response Schema

- `id` (string, required) Example: `card_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `brand` (string, required) Example: `visa`
- `last4` (string,null, required) Example: `4242`
- `expMonth` (number,null, required) Example: `12`
- `expYear` (number,null, required) Example: `2028`
- `cardholderName` (string,null, required) Example: `null`
- `isPrimary` (boolean, required) Example: `true`
- `addedAt` (string,null, required) Example: `2026-04-27T12:00:00.000Z`

### Responses

#### 201 - Saved card stored.
```json
{
  "id": "card_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "brand": "visa",
  "last4": "4242",
  "expMonth": 12,
  "expYear": 2028,
  "cardholderName": null,
  "isPrimary": true,
  "addedAt": "2026-04-27T12:00:00.000Z"
}
```

#### 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"
}
```