PHP ActiveX GMail: Parse GMail REST API Error Response

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Gets the current user's Gmail profile, but shows an error response and how to parse it..

Documentation: https://developers.google.com/gmail/api/v1/reference/users/getProfile

<?php

$rest = new COM("Chilkat_9_5_0.Rest");

//   Provide a previously obtained OAuth2 access token.
$oauth2 = new COM("Chilkat_9_5_0.OAuth2");
$oauth2->AccessToken = 'OAUTH2_ACCESS_TOKEN';
$rest->SetAuthOAuth2($oauth2);

$success = $rest->Connect('www.googleapis.com',443,1,1);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

$rest->AddPathParam('userId','matt@chilkat.io');

$sbJson = new COM("Chilkat_9_5_0.StringBuilder");
$success = $rest->FullRequestNoBodySb('GET','/gmail/v1/users/userId/profile',$sbJson);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

if ($rest->ResponseStatusCode != 200) {
    print 'Received error response code: ' . $rest->ResponseStatusCode . "\n";
    print 'Response body:' . "\n";
    print $sbJson->getAsString() . "\n";
    exit;
}

$json = new COM("Chilkat_9_5_0.JsonObject");
$json->LoadSb($sbJson);

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.

$errorCode = $json->IntOf('error.code');
$errorMessage = $json->stringOf('error.message');
$i = 0;
$count_i = $json->SizeOfArray('error.errors');
while ($i < $count_i) {
    $json->I = $i;
    $domain = $json->stringOf('error.errors[i].domain');
    $reason = $json->stringOf('error.errors[i].reason');
    $message = $json->stringOf('error.errors[i].message');
    $extendedHelp = $json->stringOf('error.errors[i].extendedHelp');
    $i = $i + 1;
}

print 'Example Completed.' . "\n";

?>

Sample JSON Response Body

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.",
    "extendedHelp": "https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735"
   }
  ],
  "code": 403,
  "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry."
 }
}