Bug fix for prestashop(eCommerce) website.

Hello freelancer, we have our online store in prestshop platform. we need to fix some bugs from this site. bugs that have to fixed :- 1. shopping card 2. credit card processing Right now calculations of total price in shopping cart is not working properly, so that have to fix and in credit card payments there is no option to save txn id in db. If you have skills in prestashop, you can bid on my project. Happy bidding :-) Thanks