(Unicode 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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#include <C_CkHttpW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkHttpW http;
    HCkHttpRequestW req;
    HCkHttpResponseW resp;
    int statusCode;
    HCkJsonObjectW json;
    BOOL success;

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

    http = CkHttpW_Create();

    // 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

    req = CkHttpRequestW_Create();
    CkHttpRequestW_AddParam(req,L"grant_type",L"refresh_token");
    CkHttpRequestW_AddParam(req,L"refresh_token",L"Aztr|...");
    CkHttpRequestW_AddParam(req,L"client_id",L"foodev");
    CkHttpRequestW_AddParam(req,L"client_secret",L"Y76SDl2F");

    CkHttpRequestW_AddHeader(req,L"Host",L"api.amazon.com");

    resp = CkHttpW_PostUrlEncoded(http,L"https://api.amazon.com/auth/o2/token",req);
    if (CkHttpW_getLastMethodSuccess(http) == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        return;
    }

    statusCode = CkHttpResponseW_getStatusCode(resp);
    wprintf(L"Status Code = %d\n",statusCode);

    json = CkJsonObjectW_Create();
    CkJsonObjectW_Load(json,CkHttpResponseW_bodyStr(resp));
    CkHttpResponseW_Dispose(resp);

    CkJsonObjectW_putEmitCompact(json,FALSE);
    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    if (statusCode != 200) {
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkJsonObjectW_Dispose(json);
        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...)
    success = CkJsonObjectW_WriteFile(json,L"qa_data/tokens/sp_api_lwa_token.json");

    wprintf(L"access_token: %s\n",CkJsonObjectW_stringOf(json,L"access_token"));
    wprintf(L"Success.\n");


    CkHttpW_Dispose(http);
    CkHttpRequestW_Dispose(req);
    CkJsonObjectW_Dispose(json);

    }