(.NET Core C#) Walmart v3 Bulk Item Setup

Updates items in bulk.

For more information, see https://developer.walmart.com/#/apicenter/marketPlace/latest#bulkCreateUpdateItems

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();
bool success;

// Implements the following CURL command:

// curl -X POST \
//   https://marketplace.walmartapis.com/v3/feeds?feedType=item \
//   -H 'WM_SVC.NAME: Walmart Marketplace'
//   -H 'WM_SEC.ACCESS_TOKEN: eyJraWQiOiIzZjVhYTFmNS1hYWE5LTQzM.....'
//   -H 'WM_QOS.CORRELATION_ID: b3261d2d-028a-4ef7-8602-633c23200af6'
//   -H 'Content-Type: multipart/form-data'
//   -H 'Accept: application/xml'
//   -F feed=@qa_data/walmart/itemFeed.xml

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.HttpVerb = "POST";
req.Path = "/v3/feeds?feedType=item";
req.ContentType = "multipart/form-data";
success = req.AddFileForUpload2("feed","qa_data/walmart/itemFeed.xml","application/xml");

req.AddHeader("WM_QOS.CORRELATION_ID","b3261d2d-028a-4ef7-8602-633c23200af6");
req.AddHeader("Expect","100-continue");
req.AddHeader("Content-Type","multipart/form-data");
req.AddHeader("WM_SEC.ACCESS_TOKEN","eyJraWQiOiIzZjVhYTFmNS1hYWE5LTQzM.....");
req.AddHeader("Accept","application/xml");
req.AddHeader("WM_SVC.NAME","Walmart Marketplace");

Chilkat.HttpResponse resp = http.SynchronousRequest("marketplace.walmartapis.com",443,true,req);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
resp.GetBodySb(sbResponseBody);

Chilkat.Xml xmlResponse = new Chilkat.Xml();
xmlResponse.LoadSb(sbResponseBody,true);
Debug.WriteLine(xmlResponse.GetXml());

// Sample XML response:
// (Sample code for parsing the XML response is shown below)

// <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
// <FeedAcknowledgement xmlns:ns2="http://walmart.com/">
//     <feedId>E9C04D1FFD99479FBC1341D56DD5F930@AQMB_wA</feedId>
// </FeedAcknowledgement>

// Sample code for parsing the XML response...
// Use the following online tool to generate parsing code from sample XML:
// Generate Parsing Code from XML

string FeedAcknowledgement_xmlns_ns2;
string feedId;

FeedAcknowledgement_xmlns_ns2 = xmlResponse.GetAttrValue("xmlns:ns2");
feedId = xmlResponse.GetChildContent("feedId");