(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 <CkHttpW.h>
#include <CkHttpRequestW.h>
#include <CkHttpResponseW.h>
#include <CkJsonObjectW.h>

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

    CkHttpW http;

    // 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

    CkHttpRequestW req;
    req.AddParam(L"grant_type",L"refresh_token");
    req.AddParam(L"refresh_token",L"Aztr|...");
    req.AddParam(L"client_id",L"foodev");
    req.AddParam(L"client_secret",L"Y76SDl2F");

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

    CkHttpResponseW *resp = http.PostUrlEncoded(L"https://api.amazon.com/auth/o2/token",req);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    int statusCode = resp->get_StatusCode();
    wprintf(L"Status Code = %d\n",statusCode);

    CkJsonObjectW json;
    json.Load(resp->bodyStr());
    delete resp;

    json.put_EmitCompact(false);
    wprintf(L"%s\n",json.emit());

    if (statusCode != 200) {
        wprintf(L"Failed.\n");
        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(L"qa_data/tokens/sp_api_lwa_token.json");

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