curl --request GET \
  --url https://api.altostrat.io/workspaces/{workspaceId}/billing-accounts \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "cus_a1b2c3d4e5f6g7h8",
      "workspace_id": "ws_a1b2c3d4e5f6g7h8",
      "name": "ACME Corp Billing",
      "email": "billing@acme.com",
      "phone": "+15551234567",
      "description": "For US-based operations",
      "currency": "usd",
      "address": {
        "country": "US",
        "line1": "123 Main Street",
        "line2": "Suite 456",
        "city": "San Francisco",
        "state": "CA",
        "postal_code": "94105"
      },
      "created_at": "2025-10-29T00:40:06.000000Z",
      "updated_at": "2025-10-29T00:40:06.000000Z"
    }
  ],
  "has_more": false
}