(Objective-C) Amazon SP-API Request an LWA access token

See more Amazon SP-API Examples

Request an LWA access token, make a secure HTTP POST to the LWA authentication server (https://api.amazon.com/auth/o2/token)

For more information, see https://developer-docs.amazon.com/sp-api/docs/connecting-to-the-selling-partner-api

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoHttpResponse.h>
#import <CkoJsonObject.h>

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

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

// Implements the following CURL command:

// curl -X POST https://example.com/auth/o2/token \
//   -H "Host: api.amazon.com" \
//   -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" \
//   -d "grant_type=refresh_token" \
//   -d "refresh_token=Aztr|..." \
//   -d "client_id=foodev" \
//   -d "client_secret=Y76SDl2F"

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"refresh_token"];
[req AddParam: @"refresh_token" value: @"Aztr|..."];
[req AddParam: @"client_id" value: @"foodev"];
[req AddParam: @"client_secret" value: @"Y76SDl2F"];

[req AddHeader: @"Host" value: @"api.amazon.com"];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://api.amazon.com/auth/o2/token" req: req];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int statusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Status Code = ",statusCode);

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];

json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

if (statusCode != 200) {
    NSLog(@"%@",@"Failed.");
    return;
}

// Success returns this JSON:

// {
//   "access_token": "Atza|...",
//   "refresh_token": "Atzr|...",
//   "token_type": "bearer",
//   "expires_in": 3600
// }

// Save the JSON token to a file for use in subsequent calls.
// (this example is passing a relative file path.  You don't need to save to a file
// if, for example, you keep the access token in-memory for subsequent use...)
BOOL success = [json WriteFile: @"qa_data/tokens/sp_api_lwa_token.json"];

NSLog(@"%@%@",@"access_token: ",[json StringOf: @"access_token"]);
NSLog(@"%@",@"Success.");