(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).

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

Chilkat C/C++ Library Downloads
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#include <C_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    BOOL success;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    HCkStringBuilder sbResponseBody;
    HCkJsonObject jResp;
    int respStatusCode;
    const char *token_type;
    const char *access_token;
    int expires_in;
    int consented_on;
    const char *scope;

    // 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 --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'

    CkHttp_putLogin(http,"client-id");
    CkHttp_putPassword(http,"client-secret");

    req = CkHttpRequest_Create();
    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putPath(req,"/gcb/api/clientCredentials/oauth2/token/us/gcb");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");
    CkHttpRequest_AddParam(req,"grant_type","client_credentials");
    CkHttpRequest_AddParam(req,"scope","/api");
    CkHttpRequest_AddHeader(req,"accept","application/json");

    resp = CkHttp_PostUrlEncoded(http,"https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb",req);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        return;
    }

    sbResponseBody = CkStringBuilder_Create();
    CkHttpResponse_GetBodySb(resp,sbResponseBody);
    jResp = CkJsonObject_Create();
    CkJsonObject_LoadSb(jResp,sbResponseBody);
    CkJsonObject_putEmitCompact(jResp,FALSE);

    printf("Response Body:\n");
    printf("%s\n",CkJsonObject_emit(jResp));

    respStatusCode = CkHttpResponse_getStatusCode(resp);
    printf("Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        printf("Response Header:\n");
        printf("%s\n",CkHttpResponse_header(resp));
        printf("Failed.\n");
        CkHttpResponse_Dispose(resp);
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkStringBuilder_Dispose(sbResponseBody);
        CkJsonObject_Dispose(jResp);
        return;
    }

    CkHttpResponse_Dispose(resp);

    success = CkJsonObject_WriteFile(jResp,"qa_data/tokens/citi_client_credentials.json");
    if (success == FALSE) {
        printf("Failed to save JSON access token file.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkStringBuilder_Dispose(sbResponseBody);
        CkJsonObject_Dispose(jResp);
        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

    token_type = CkJsonObject_stringOf(jResp,"token_type");
    access_token = CkJsonObject_stringOf(jResp,"access_token");
    expires_in = CkJsonObject_IntOf(jResp,"expires_in");
    consented_on = CkJsonObject_IntOf(jResp,"consented_on");
    scope = CkJsonObject_stringOf(jResp,"scope");


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkStringBuilder_Dispose(sbResponseBody);
    CkJsonObject_Dispose(jResp);

    }