POST /v1/direct/order/refund-request

{
   "orderID":{
      "type":"string",
      "description":"This orderID is the one generated by your integration. If you are using an integration like Salesforce this will be the ID of the order created in Salesforce.",
      "required":true
   },
   "amount":{
      "type":"number",
      "description":"Specified when the refund request is a partial refund request with a specific amount. This amount must be less than the order total."
   }
}