# PUT /billing/sources/{id}
URL: https://developers.vsee.io/api/payment-api/put/billing/sources/%7Bid%7D
Auth: User Token — Requires a user access token from login or SSO.

Set default payment source

Set a payment source as default

Parameters:
- X-ApiToken (header, string, required) — API token
- X-AccountCode (header, string, required) — Account code
- id (path, string, required) — Payment source ID

Request body (application/json):
- is_default (boolean, optional)
- room_code (string, optional)
- provider_id (string, optional)

Example request:
```json
{
  "is_default": true,
  "room_code": "string",
  "provider_id": "string"
}
```

Responses:
- 200 — Successful update
```json
{
  "data": {
    "id": "card_19DrgXBY2jn2BCqQNpjjzuay",
    "type": "card",
    "brand": "Visa",
    "exp_month": 8,
    "exp_year": 2017,
    "last4": "4242",
    "is_default": true
  }
}
```