(Perl) 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

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# 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

$jsonToken = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/docusign.json");
if ($success != 1) {
    print "Failed to load docusign.json" . "\r\n";
    exit;
}

# The access token JSON looks like this:

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

$oauth2 = chilkat::CkOAuth2->new();

# 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->put_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->put_ClientId("MY_DOCUSIGN_CLIENT_ID");
# This is your secret key for the authorization code grant.
$oauth2->put_ClientSecret("MY_DOCUSIGN_CLIENT_SECRET");

# Get the "refresh_token"
$oauth2->put_RefreshToken($jsonToken->stringOf("refresh_token"));

# Send the HTTP POST to refresh the access token..
$success = $oauth2->RefreshAccessToken();
if ($success != 1) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

print "New access token: " . $oauth2->accessToken() . "\r\n";
print "New refresh token: " . $oauth2->refreshToken() . "\r\n";

# 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.
$sbJson = chilkat::CkStringBuilder->new();
$jsonToken->put_EmitCompact(0);
$jsonToken->EmitSb($sbJson);
$sbJson->WriteFile("qa_data/tokens/docusign.json","utf-8",0);

print "OAuth2 authorization granted!" . "\r\n";
print "New Access Token = " . $oauth2->accessToken() . "\r\n";