curl --request GET \
  --url https://api.paygentic.io/v0/billingSchedules/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "object": "billing_schedule",
  "merchantId": "<string>",
  "startDate": "2023-11-07T05:31:56Z",
  "endDate": "2023-11-07T05:31:56Z",
  "billingAnchor": "2023-11-07T05:31:56Z",
  "customPeriodWindows": [
    "<unknown>"
  ],
  "metadata": {},
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "orderId": "<string>",
  "subscriptionId": "<string>",
  "paymentTermDays": 123,
  "deletedAt": "2023-11-07T05:31:56Z"
}