Bing Ads Offline Conversion confusion after proper OATH process - php

Question

I am using https://github.com/BingAds/BingAds-PHP-SDK to send offline conversion data to Bing. I am successfully able to connect and call different service using OATH. But when I am trying to send offline conversion request I am failed. Bing SOAP request's example for Offline conversion requests https://msdn.microsoft.com/en-us/library/bing-ads-campaign-management-applyofflineconversions.aspx
Now, I need help from you guys, If I want to send ApplyOfflineConversionsRequest what approach should I use SoapVar and then CampaignManagement ApplyOfflineConversions? I am asking this because I am not very well known about the Bing API v11.
After my proper OATH process
//Setting the account id as CustomerAccountId in the header element as per Bing API Doc
$GLOBALS['AuthorizationData']->AccountId = $obj->Id;
//send offline conversion
$offline = new OfflineConversion();
$offline->ConversionCurrencyCode = 'USD';
$offline->ConversionName = 'OfflineConversionSellOfRentals';
$offline->ConversionTime = date('Y-m-d\TH:i:s', strtotime('-7 days'));
$offline->ConversionValue = 2.5;
$offline->MicrosoftClickId = '8349a6501442491186ce602ca56881fe';
$offline_response = new SoapVar($offline, SOAP_ENC_OBJECT, 'OfflineConversion', $GLOBALS['CampaignProxy']->GetNamespace());
$request[] = $offline_response;
$offline_response = CampaignManagementHelper::ApplyOfflineConversions($request);
print_r($offline_response);
I have created a static method inside CampaignManagementHelper.php file because I didn't find any implementation of AddOfflineConversion method on the Bing API SDK.
static function AddOfflineConversion($offline){
$GLOBALS['Proxy'] = $GLOBALS['CampaignProxy'];
$request = new ApplyOfflineConversionsRequest();
$request->OfflineConversions[] = $offline;
return $GLOBALS['CampaignProxy']->GetService()->ApplyOfflineConversions($request);
}
I am able to import offline CSV conversion that means My UET Tags and Conversion Goal are enabled.
I am having a hard time because I didn't get any sample example for how to request for offline conversion requests.
Response from Bing API call:
stdClass Object
(
[PartialErrors] => stdClass Object
(
)
)