Invoice does not receive via email

I tried offline payment and I received the order details via email, but when I tried Paypal payment I did not receive anything.
How can I fix this without updating eshop? Thanks
EShop version 1.2.7
Joomla 2.5

My mistake, I checked it and I learned that I have to set manually the order status to be able to receive the invoice of the customer right? My concern now was I (as owner) did not receive alert notification that order has been made when paid through Paypal. PLease advice, thanks

Hello Paula,

If customer go to PayPal and made the payment to complete order from there, then you and customer should get the notification emails automatically.

Sincerely, Giang