Need Sample working payload for Split a shipment line into multiple lines Rest API

Our Requirement is to Split the Shipment line to multiple line based on the Requested quantity to Split.

We found the Recently added Rest API on 25A Split a shipment line into multiple lines Rest API

/fscmRestApi/resources/11.13.18.05/shipmentLineChangeRequests

We Tried the below request payload and its erroring with 400 bad request.

Request: {
"name": "splitToMultipleLines",
"parameters": [
{
"shipmentLine": 3971159,
"details":
[{
"quantity": 1000
}]

    }
]

}

No example has been provided on the documentation.