"IssueCaseRefund" of Ebay post-order API Not working using C#

I want to "IssueCaseRefund" using ebay post-order Api

i have used these Api Url for "IssueCaseRefund" details using post method

Api Url is:  POST https://api.ebay.com/post-order/v2/casemanagement/{caseId}/issue_refund

 i have also ebay auth token as Authorization in header.

When it run into postman by using above details
 then Api throws "Page not responding"

I also developed Api call in C#

My code details

// Set issue to return url
  string returnUrl = "https://api.ebay.com/post-order/v2/casemanagement/" + CaseId + "/issue_refund";
   HttpWebRequest returnRequest = (HttpWebRequest)WebRequest.Create(returnUrl);
   returnRequest.Method = "POST";
   // Set EbayToken
   returnRequest.Headers.Add("authorization", eBayToken);
   //returnRequest.Headers.Add("authorization", eBayToken);
    using (HttpWebResponse returnResponse = (HttpWebResponse)returnRequest.GetResponse())
        using (Stream returnStream = returnResponse.GetResponseStream())
             using (StreamReader returnReader = new StreamReader(returnStream))
                     // Get Api Response
                     string returnResponseText = returnReader.ReadToEnd();

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Please guide me how to "IssueCaseRefund" using ebay post order Api
Jitendra TripathiAsked:
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Martin MillerCTOCommented:
Are you sure this is a POST needed verse a GET request?

I found mention of the following:
  • Trading API expects calls to use the HTTP POST
  • Post-Order API operation uses a GET HTTP

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Martin MillerCTOCommented:
Can we close this question ?
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