Zig

citi Developer OAuth2 Client Credentials Grant

See more OAuth2 Examples

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). Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const http = try chilkat.Http.init();
    defer http.deinit();

    // 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.setLogin("client-id");
    http.setPassword("client-secret");

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.setHttpVerb("POST");
    req.setPath("/gcb/api/clientCredentials/oauth2/token/us/gcb");
    req.setContentType("application/x-www-form-urlencoded");
    req.addParam("grant_type", "client_credentials");
    req.addParam("scope", "/api");
    req.addHeader("accept", "application/json");

    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpReq("https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb", req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    const sb_response_body = try chilkat.StringBuilder.init();
    defer sb_response_body.deinit();
    resp.getBodySb(sb_response_body) catch {};
    const j_resp = try chilkat.JsonObject.init();
    defer j_resp.deinit();
    j_resp.loadSb(sb_response_body) catch {};
    j_resp.setEmitCompact(false);

    std.debug.print("Response Body:\n", .{});
    std.debug.print("{s}\n", .{try j_resp.emit(alloc)});

    const resp_status_code = resp.getStatusCode();
    std.debug.print("Response Status Code = {d}\n", .{resp_status_code});
    if (resp_status_code >= 400) {
        std.debug.print("Response Header:\n", .{});
        std.debug.print("{s}\n", .{try resp.getHeader(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    j_resp.writeFile("qa_data/tokens/citi_client_credentials.json") catch {
        std.debug.print("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

    _ = try j_resp.stringOf(alloc, "token_type");
    _ = try j_resp.stringOf(alloc, "access_token");
    _ = j_resp.intOf("expires_in");
    _ = j_resp.intOf("consented_on");
    _ = try j_resp.stringOf(alloc, "scope");
}