AutoIt
Walmart v3 Item Setup by Match

Provides a quick and convenient way to set up items by matching your items to existing item content on Walmart.com.
Chilkat AutoIt Downloads

AutoIt
Local $bSuccess = False

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

$oHttp = ObjCreate("Chilkat.Http")

; 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: application/json'
;   -H 'Accept: application/json'
;   -d '{
;     "MPItemFeedHeader": {
;         "version": "3.2.1"
;     },
;     "MPItem": [
;         {
;             "sku": "setup_by_ref",
;             "productIdentifiers": [
;                 {
;                     "productIdType": "GTIN",
;                     "productId": "05518319011365"
;                 }
;             ],
;             "MPProduct": {
;                 "category": "Electronics",
;                 "subCategory": "ElectronicsAccessories"
;             },
;             "MPOffer": {
;                 "price": 12.00,
;                 "shippingWeight": {
;                     "measure": 0.5,
;                     "unit": "lb"
;                 },
;                 "productTaxCode": 2038710
;             }
;         }
;     ]
; }'

; Use this online tool to generate code from sample JSON:
; Generate Code to Create JSON

; The following JSON is sent in the request body.

; {
;   "MPItemFeedHeader": {
;     "version": "3.2.1"
;   },
;   "MPItem": [
;     {
;       "sku": "setup_by_ref",
;       "productIdentifiers": [
;         {
;           "productIdType": "GTIN",
;           "productId": "05518319011365"
;         }
;       ],
;       "MPProduct": {
;         "category": "Electronics",
;         "subCategory": "ElectronicsAccessories"
;       },
;       "MPOffer": {
;         "price": 12.00,
;         "shippingWeight": {
;           "measure": 0.5,
;           "unit": "lb"
;         },
;         "productTaxCode": 2038710
;       }
;     }
;   ]
; }

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.UpdateString("MPItemFeedHeader.version","3.2.1")
$oJson.UpdateString("MPItem[0].sku","setup_by_ref")
$oJson.UpdateString("MPItem[0].productIdentifiers[0].productIdType","GTIN")
$oJson.UpdateString("MPItem[0].productIdentifiers[0].productId","05518319011365")
$oJson.UpdateString("MPItem[0].MPProduct.category","Electronics")
$oJson.UpdateString("MPItem[0].MPProduct.subCategory","ElectronicsAccessories")
$oJson.UpdateNumber("MPItem[0].MPOffer.price","12.00")
$oJson.UpdateNumber("MPItem[0].MPOffer.shippingWeight.measure","0.5")
$oJson.UpdateString("MPItem[0].MPOffer.shippingWeight.unit","lb")
$oJson.UpdateInt("MPItem[0].MPOffer.productTaxCode",2038710)

$oHttp.SetRequestHeader "WM_QOS.CORRELATION_ID","b3261d2d-028a-4ef7-8602-633c23200af6"
$oHttp.SetRequestHeader "Content-Type","application/json"
$oHttp.SetRequestHeader "WM_SEC.ACCESS_TOKEN","eyJraWQiOiIzZjVhYTFmNS1hYWE5LTQzM....."
$oHttp.SetRequestHeader "Accept","application/json"
$oHttp.SetRequestHeader "WM_SVC.NAME","Walmart Marketplace"

$oResp = ObjCreate("Chilkat.HttpResponse")
$bSuccess = $oHttp.HttpJson("POST","https://marketplace.walmartapis.com/v3/feeds?feedType=item",$oJson,"application/json",$oResp)
If ($bSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

$oSbResponseBody = ObjCreate("Chilkat.StringBuilder")
$oResp.GetBodySb($oSbResponseBody)
$oJResp = ObjCreate("Chilkat.JsonObject")
$oJResp.LoadSb($oSbResponseBody)
$oJResp.EmitCompact = False

ConsoleWrite("Response Body:" & @CRLF)
ConsoleWrite($oJResp.Emit() & @CRLF)

Local $iRespStatusCode = $oResp.StatusCode
ConsoleWrite("Response Status Code = " & $iRespStatusCode & @CRLF)
If ($iRespStatusCode >= 400) Then
    ConsoleWrite("Response Header:" & @CRLF)
    ConsoleWrite($oResp.Header & @CRLF)
    ConsoleWrite("Failed." & @CRLF)
    Exit
EndIf

; Sample JSON response:
; (Sample code for parsing the JSON response is shown below)

; {
;   "feedId": "BC141881F6BB4B5891F084B225581BF2@AUUBAQA"
; }

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

Local $sFeedId

$sFeedId = $oJResp.StringOf("feedId")