(C) 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.)

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#include <C_CkJsonObject.h>
#include <C_CkOAuth2.h>

void ChilkatSample(void)
    {
    HCkJsonObject json;
    BOOL success;
    HCkOAuth2 oauth2;

    // 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"
    // }

    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/ebay-access-token.json");
    if (success == FALSE) {
        printf("Failed to load the existing ebay access token JSON.\n");
        CkJsonObject_Dispose(json);
        return;
    }

    oauth2 = CkOAuth2_Create();

    CkOAuth2_putTokenEndpoint(oauth2,"https://api.sandbox.ebay.com/identity/v1/oauth2/token");

    // Replace these with actual values.
    CkOAuth2_putClientId(oauth2,"EBAY_CLIENT_ID");
    CkOAuth2_putClientSecret(oauth2,"EBAY_CLIENT_SECRET");

    // Get the "refresh_token"
    CkOAuth2_putRefreshToken(oauth2,CkJsonObject_stringOf(json,"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = CkOAuth2_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkJsonObject_Dispose(json);
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // Load the access token response into the JSON object 
    CkJsonObject_Load(json,CkOAuth2_accessTokenResponse(oauth2));

    // 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.
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_WriteFile(json,"qa_data/tokens/ebay-access-token.json");

    printf("OAuth2 authorization granted!\n");
    printf("New Access Token = %s\n",CkOAuth2_accessToken(oauth2));


    CkJsonObject_Dispose(json);
    CkOAuth2_Dispose(oauth2);

    }