(C#) Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-code-grant

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

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Docusign OAuth2 Access Token

Chilkat.JsonObject jsonToken = new Chilkat.JsonObject();
bool success = jsonToken.LoadFile("qa_data/tokens/docusign.json");
if (success != true) {
    Debug.WriteLine("Failed to load docusign.json");
    return;
}

// The access token JSON looks like this:

// {
//   "access_token": "eyJ0eXA....YQyig",
//   "token_type": "Bearer",
//   "refresh_token": "eyJ0eXA....auE3eHKg",
//   "expires_in": 28800
// }

Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();

// For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
// For the production platform, the token endpoint is https://account.docusign.com/oauth/token
oauth2.TokenEndpoint = "https://account-d.docusign.com/oauth/token";

// Replace these with actual values.
// The client ID is also known as the "integration key" in Docusign.
oauth2.ClientId = "MY_DOCUSIGN_CLIENT_ID";
// This is your secret key for the authorization code grant.
oauth2.ClientSecret = "MY_DOCUSIGN_CLIENT_SECRET";

// Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token");

// Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken();
if (success != true) {
    Debug.WriteLine(oauth2.LastErrorText);
    return;
}

Debug.WriteLine("New access token: " + oauth2.AccessToken);
Debug.WriteLine("New refresh token: " + oauth2.RefreshToken);

// Update the JSON with the new tokens.
jsonToken.UpdateString("access_token",oauth2.AccessToken);
jsonToken.UpdateString("refresh_token",oauth2.RefreshToken);

// Save the new JSON access token response to a file.
Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder();
jsonToken.EmitCompact = false;
jsonToken.EmitSb(sbJson);
sbJson.WriteFile("qa_data/tokens/docusign.json","utf-8",false);

Debug.WriteLine("OAuth2 authorization granted!");
Debug.WriteLine("New Access Token = " + oauth2.AccessToken);