Plugin for PayuMoney payment gateway

[ciphercraft]

I have a plugin for PayUMoney Payment Gateway and Im using it for my Joomla 3.5.1 site with Virtuemart 3.0.14. Everything is working fine excepting the redirection to the site from the Payment Gateway. The return URL is specified as index.php?option=com_virtuemart&view=pluginresponse&task=pluginresponsereceived&on=' . $order['details']['BT']->order_number . '&pm=' . $order['details']['BT']->virtuemart_paymentmethod_id.'&DR={DR}'); and it is showing me a 404 page. However, if Im using the link /index.php?option=com_virtuemart&view=pluginresponse&task=pluginresponsereceived then Im being taken to the Thank you page but the same is being shown for successful, failed or cancelled transactions.

However, the Thank you page does not reveal the Order number and other details.

I have Joomla SEF enabled.

Can anyone please provide me help in solving this issue?