(Objective-C) Walmart - Get Inventory for an Item

Demonstrates how to get inventory for an item and parse the result.

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#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoAuthUtil.h>
#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoXml.h>

// ---------------------------------------------------------------------------------------------------------
// Note: This example is deprecated.  The Walmart API no longer uses the Signature method of authenticating.
// Walmart now uses OAuth2.  
// ---------------------------------------------------------------------------------------------------------

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

// Sends the following GET request:
// GET https://marketplace.walmartapis.com/v2/inventory?sku={SKU}

CkoStringBuilder *sbUrl = [[CkoStringBuilder alloc] init];
BOOL success = [sbUrl Append: @"https://marketplace.walmartapis.com/v2/inventory?sku={SKU}"];
int numReplaced = [[sbUrl Replace: @"{SKU}" replacement: @"HOPP~904~51041"] intValue];

NSString *requestMethod = @"GET";

// First we need to generate a signature for our request.
// The signature needs to be re-generated for each new Walmart HTTP request.
CkoAuthUtil *authUtil = [[CkoAuthUtil alloc] init];

NSString *wmConsumerId = @"WALMART_CONSUMER_ID";
NSString *wmPrivateKey = @"WALMART_PRIVATE_KEY";
NSString *jsonStr = [authUtil WalmartSignature: [sbUrl GetAsString] consumerId: wmConsumerId privateKey: wmPrivateKey requestMethod: requestMethod];
if (authUtil.LastMethodSuccess != YES) {
    NSLog(@"%@",authUtil.LastErrorText);
    return;
}

// The JSON returned by WalmartSignature contains the values to be used in the following
// header fields: WM_SEC.AUTH_SIGNATURE, WM_SEC.TIMESTAMP, and WM_QOS.CORRELATION_ID
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: jsonStr];

CkoHttp *http = [[CkoHttp alloc] init];
[http SetRequestHeader: @"WM_SVC.NAME" value: @"Walmart Marketplace"];
[http SetRequestHeader: @"WM_QOS.CORRELATION_ID" value: [json StringOf: @"correlation_id"]];
[http SetRequestHeader: @"WM_SEC.TIMESTAMP" value: [json StringOf: @"timestamp"]];
[http SetRequestHeader: @"WM_SEC.AUTH_SIGNATURE" value: [json StringOf: @"signature"]];
[http SetRequestHeader: @"WM_CONSUMER.ID" value: wmConsumerId];
http.Accept = @"application/xml";

// Note: Do not explicitly set the "Host" header.  Chilkat will set it automatically.

NSString *xmlStr = [http QuickGetStr: [sbUrl GetAsString]];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoXml *xml = [[CkoXml alloc] init];
[xml LoadXml: xmlStr];

// A successful response should have a 200 response status
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@",[xml GetXml]);
    NSLog(@"%@%d",@"Response Status Code: ",[http.LastStatus intValue]);
    NSLog(@"%@",@"Failed.");
    return;
}

// A sample XML response is shown below..
NSLog(@"%@",[xml GetXml]);
NSLog(@"%@",@"--");

// To get the quantity:
int quantity = [[xml GetChildIntValue: @"quantity|amount"] intValue];
NSLog(@"%@%d",@"quantity = ",quantity);

// ---------------------------------------
// Sample XML response
// ---------------------------------------

// <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
// <inventory xmlns="http://walmart.com/">
//     <sku>HOPP~904~51041</sku>
//     <quantity>
//         <unit>EACH</unit>
//         <amount>234</amount>
//     </quantity>
//     <fulfillmentLagTime>5</fulfillmentLagTime>
// </inventory>