Email Not Working And Paypal Recall Issues In Responsive Shop Theme

I have Responsive Shop Theme installed on my site but I’m having issues with the email system and the paypal recall page.

1. I set up the emails for Welcome Email, Admin and New Orders but unfortunately, the new members are not receiving any email and the new order emails is not being sent to the buyer.

But the admin is receiving emails but there is another issue with that. The admin email that is being received is just showing the product price. The shipping and tax is showing $0 in the email being received by admin, whereas the shipping and tax is included and paid for. Also, the total is just showing whatever the products price total, not the complete total that includes the the shipping and tax.

2. The paypal callback is not return buyer to the callback page after payment and I put the correct URL inside paypal Return URL (https://domainname.com/callback/?status=thankyou). It is taking the buyer to “Payment Failed” page even though the payment is already processed by paypal.

Please, help.

Thanks.