(Unicode C++) citi Developer OAuth2 Client Credentials Grant

Get access token for your application credentials. You can use this for citi APIs which do not require customer credential verification and consent (e.g. Onboarding).

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://sandbox.developerhub.citi.com/api/united-states/retail-bank/identity-security/authorize/documentation

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

void ChilkatSample(void)
    {
    bool success = false;

    // 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 --request POST \
    //   --url https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb \
    //   --header 'accept: application/json' \
    //   --user client-id:client-secret \
    //   --header 'content-type: application/x-www-form-urlencoded' \
    //   --data 'grant_type=client_credentials&scope=%2Fapi'

    http.put_Login(L"client-id");
    http.put_Password(L"client-secret");

    CkHttpRequestW req;
    req.put_HttpVerb(L"POST");
    req.put_Path(L"/gcb/api/clientCredentials/oauth2/token/us/gcb");
    req.put_ContentType(L"application/x-www-form-urlencoded");
    req.AddParam(L"grant_type",L"client_credentials");
    req.AddParam(L"scope",L"/api");
    req.AddHeader(L"accept",L"application/json");

    CkHttpResponseW resp;
    success = http.HttpReq(L"https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb",req,resp);
    if (success == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkStringBuilderW sbResponseBody;
    resp.GetBodySb(sbResponseBody);
    CkJsonObjectW jResp;
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    wprintf(L"Response Body:\n");
    wprintf(L"%s\n",jResp.emit());

    int respStatusCode = resp.get_StatusCode();
    wprintf(L"Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",resp.header());
        wprintf(L"Failed.\n");
        return;
    }

    success = jResp.WriteFile(L"qa_data/tokens/citi_client_credentials.json");
    if (success == false) {
        wprintf(L"Failed to save JSON access token file.\n");
        return;
    }

    //  Sample JSON response:
    //  (Sample code for parsing the JSON response is shown below)

    //  {
    //    "token_type": "bearer",
    //    "access_token": "AAIkMjdh ... 3fsWb7zJ0s",
    //    "expires_in": 1800,
    //    "consented_on": 1584817860,
    //    "scope": "/api"
    //  }

    //  Sample code for parsing the JSON response...
    //  Use the following online tool to generate parsing code from sample JSON:
    //  Generate Parsing Code from JSON

    const wchar_t *token_type = jResp.stringOf(L"token_type");
    const wchar_t *access_token = jResp.stringOf(L"access_token");
    int expires_in = jResp.IntOf(L"expires_in");
    int consented_on = jResp.IntOf(L"consented_on");
    const wchar_t *scope = jResp.stringOf(L"scope");
    }