curl -X GET "https://frontier.example.com/v1beta1/organizations/{org_id}/billing" \
  -H "Authorization: Bearer <token>"

{
  "billing_accounts": [
    {
      "id": "billing_acc_123",
      "org_id": "org_123",
      "name": "Acme Corp Billing",
      "email": "[email protected]",
      "phone": "+1234567890",
      "currency": "usd",
      "state": "active",
      "provider_id": "cus_stripe123",
      "address": {
        "line1": "123 Main St",
        "line2": "Suite 100",
        "city": "San Francisco",
        "state": "CA",
        "postal_code": "94105",
        "country": "US"
      },
      "tax_data": [
        {
          "type": "us_ein",
          "id": "12-3456789"
        }
      ],
      "metadata": {},
      "created_at": "2023-06-07T05:39:56.961Z",
      "updated_at": "2023-06-07T05:39:56.961Z"
    }
  ]
}