(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_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    int statusCode;
    HCkJsonObject json;
    BOOL success;

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

    http = CkHttp_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 = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"grant_type","refresh_token");
    CkHttpRequest_AddParam(req,"refresh_token","Aztr|...");
    CkHttpRequest_AddParam(req,"client_id","foodev");
    CkHttpRequest_AddParam(req,"client_secret","Y76SDl2F");

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

    resp = CkHttp_PostUrlEncoded(http,"https://api.amazon.com/auth/o2/token",req);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        return;
    }

    statusCode = CkHttpResponse_getStatusCode(resp);
    printf("Status Code = %d\n",statusCode);

    json = CkJsonObject_Create();
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    CkHttpResponse_Dispose(resp);

    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));

    if (statusCode != 200) {
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkJsonObject_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 = CkJsonObject_WriteFile(json,"qa_data/tokens/sp_api_lwa_token.json");

    printf("access_token: %s\n",CkJsonObject_stringOf(json,"access_token"));
    printf("Success.\n");


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkJsonObject_Dispose(json);

    }