DalPay payment gateway setup required on WooCommerce

Hello I am looking for experienced person who have completed payment gateway integration with woocommerce. I have tried all basic settings as per DalPay's own plugin for woocommerce. However there is an error related to callback (Silent post url) issue. Orders once completed is not getting responded to my server's callback url. I have attached plugin below and I am looking for someone who can setup without creating mess around. Above all, to avoid security related issues - I will be offering access on my computer with TeamViewer only. Since my site is live and in working environment Thank you!