(Objective-C) MyInvois Malaysia Login as Intermediary System

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Demonstrates how to get an OAuth2 access token with an intermediary that is representing a taxpayer (acting on behalf of a specific taxpayer). The OAuth2 access token can then be used to access MyInvois protected APIs.

For more information, see https://sdk.myinvois.hasil.gov.my/api/08-login-as-intermediary-system/

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

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

// Sends the following HTTP POST to get a MyInvois OAUth2 access token using client_credentials

// POST /connect/token HTTP/1.1
// Host: preprod-api.myinvois.hasil.gov.my
// Accept: */*
// Content-Length: <<variable>>
// Content-Type: application/x-www-form-urlencoded
// 
// client_id={YOUR_CLIENT_ID}&client_secret={YOUR_CLIENT_SECRET}&grant_type=client_credentials&scope=InvoicingAPI

// --------------------------------------------------------------------------------------------------------
// Note: There is a large amount of information about the MyInvois API on the Internet.
// The information is found at https://sdk.myinvois.hasil.gov.my/
// and also at many other companies offering solutions.
// 
// Unfortunately, it's all completely useless to the programmer wishing to implement the API.
// The reason it's useless is because no specifics are given.
// A developer needs to know the specific details of the HTTP request and response.
// What is the HTTP request Content-Type?
// What is the endpoint?
// What is the format of request body and response?  JSON or XML?
// What specific header fields are needed, if any?
// 
// Providing samples of raw HTTP requests and responses tells the developer everything he/she needs to know.
// All unknowns become known.  
// Everything becomes easy to implement.
// Just show some sample raw HTTP requests and responses, and we can all spend far less time in the office
// and more time relaxing on a beach.

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

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"client_credentials"];
[req AddParam: @"client_id" value: @"YOUR_CLIENT_ID"];
[req AddParam: @"client_secret" value: @"YOUR_CLIENT_SECRET"];
[req AddParam: @"scope" value: @"InvoicingAPI"];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://preprod-api.myinvois.hasil.gov.my/connect/token" req: req];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Note: The returned access token is valid for a short amount of time.  Perhaps 1 hour.
// The access token is used in the "Authorization: Bearer <access_token>" header in subsequent requests until it expires.
// Your application would then need to get a new access token, and so on..

NSLog(@"%@%d",@"Response Status Code: ",[resp.StatusCode intValue]);
NSLog(@"%@",@"Response Body:");
NSLog(@"%@",resp.BodyStr);

// Here's a sample response:

// {
//   "access_token": "eyJhbGciOiJSUzI1...",
//   "expires_in": 3600,
//   "token_type": "Bearer",
//   "scope": "InvoicingAPI"
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];
NSString *access_token = [json StringOf: @"access_token"];
int expires_in = [[json IntOf: @"expires_in"] intValue];
NSString *token_type = [json StringOf: @"token_type"];
NSString *scope = [json StringOf: @"scope"];

// To use an access token in a MyInvois API call, see Using a MyInvois Access Token in an API Request