(MFC) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 or greater.)

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkOAuth2.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // The previously fetched eBay access token looks like this:

    // {
    //   "access_token": "v^1.1#i^1# ... HwSAAA=",
    //   "expires_in": 7200,
    //   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
    //   "refresh_token_expires_in": 47304000,
    //   "token_type": "User Access Token"
    // }

    CkJsonObject json;
    bool success = json.LoadFile("qa_data/tokens/ebay-access-token.json");
    if (success == false) {
        strOut.append("Failed to load the existing ebay access token JSON.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkOAuth2 oauth2;

    oauth2.put_TokenEndpoint("https://api.sandbox.ebay.com/identity/v1/oauth2/token");

    // Replace these with actual values.
    oauth2.put_ClientId("EBAY_CLIENT_ID");
    oauth2.put_ClientSecret("EBAY_CLIENT_SECRET");

    // Get the "refresh_token"
    oauth2.put_RefreshToken(json.stringOf("refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken();
    if (success != true) {
        strOut.append(oauth2.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Load the access token response into the JSON object 
    json.Load(oauth2.accessTokenResponse());

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    json.put_EmitCompact(false);
    json.WriteFile("qa_data/tokens/ebay-access-token.json");

    strOut.append("OAuth2 authorization granted!");
    strOut.append("\r\n");
    strOut.append("New Access Token = ");
    strOut.append(oauth2.accessToken());
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }