(Objective-C) Shopware 6 - Get OAuth2 Access Token using Client Credentials (Integration)

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Demonstrates how to get an OAuth2 access token with an integration.

For more information, see https://docs.shopware.com/en/shopware-platform-dev-en/admin-api-guide/authentication

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <CkoHttpResponse.h>
#import <CkoStringBuilder.h>
#import <NSString.h>

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

CkoHttp *http = [[CkoHttp alloc] init];
BOOL success;

// Sends the following POST

// 	POST /api/oauth/token
// 	{
// 	    "grant_type": "client_credentials",
// 	    "client_id": "<client-id>",
// 	    "client_secret": "<client-secret>"
// 	}

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

// The following JSON is sent in the request body.

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"grant_type" value: @"client_credentials"];
[json UpdateString: @"client_id" value: @"client-id"];
[json UpdateString: @"client_secret" value: @"client-secret"];

CkoHttpResponse *resp = [http PostJson3: @"https://my-shopware-6-shop.de/api/oauth/token" contentType: @"application/json" json: json];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
[resp GetBodySb: sbResponseBody];
CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[jResp LoadSb: sbResponseBody];
jResp.EmitCompact = NO;

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",[jResp Emit]);

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");

    return;
}

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

// {
//   "token_type": "Bearer",
//   "expires_in": 600,
//   "access_token": "xxxxxxxxxxxxxx",
//   "refresh_token": "token"
// }

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

NSString *token_type = [jResp StringOf: @"token_type"];
int expires_in = [[jResp IntOf: @"expires_in"] intValue];
NSString *access_token = [jResp StringOf: @"access_token"];
NSString *refresh_token = [jResp StringOf: @"refresh_token"];

// Save our JSON to a file (to be used in other examples..)
success = [jResp WriteFile: @"qa_data/tokens/shopware6.json"];