(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 <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkHttpResponse.h>
#include <CkJsonObject.h>

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

    CkHttp 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

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

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

    CkHttpResponse *resp = http.PostUrlEncoded("https://api.amazon.com/auth/o2/token",req);
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    int statusCode = resp->get_StatusCode();
    std::cout << "Status Code = " << statusCode << "\r\n";

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

    json.put_EmitCompact(false);
    std::cout << json.emit() << "\r\n";

    if (statusCode != 200) {
        std::cout << "Failed." << "\r\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("qa_data/tokens/sp_api_lwa_token.json");

    std::cout << "access_token: " << json.stringOf("access_token") << "\r\n";
    std::cout << "Success." << "\r\n";
    }