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. Also, There is an error with all my product due to older theme that has variable. Users can not see Place Order / buy now button of variables assigned to a product. 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 I have attached error log with this project and be sure, you know what is my issue before bidding (sorry, but I see people nowadays are ready to bid on anything!) Thank you! Note, I am also facing CSS issues - If you think you can do that, Do inform me. I will consider your bid accordingly.