We requested to create a test order api error,Can you give a complete and usable example。

We try to create test orders through the following interface
Endpoint: POST
 transact.ti.com/.../test 
                Headers:
                               Authorization: Bearer {access_token}
                               Content-Type: application/json
                req:{"Orders": {"checkoutProfileId": "31xxxxx4B", "lineItems": [{"tiPartNumber": "LM317DCY", "quantity": 1}]}}
                res:{
  "errors" : [
    {
      "section" : "Generic",
      "errorType" : "Validation",
      "errorCode" : "ERR-TICOM-ORDER-API-GEN-0500",
      "reason" : "We encountered a technical issue in processing your request.",
      "message" : "The API is temporarily unavailable. Please retry, if the issue persists, Please contact TI customer support - https://support.ti.com/csm"
    }
  ]
}