Website update project

We have two websites which hold the same content which uses a SQL database lookup allow visitors to make purchases from the site by credit/ debit card. One is in Joomla and one is in WordPress. We need you to: Update the Cart so that we can collect additional information from the customer including Name, Company name, address 1, address 2, Town, Post code, contact phone number and email address as well as number being purchased; Set up the sending of emails to us where a purchase is requested (irrespective of whether the purchase is successful); Set up the sending of emails to the customer to tell them what they have purchased and whether the transaction was successful or declined; General tidy up of the cart to make sure it works properly; Ability to download the DD Mandate as a PDF or have it emailed; Addition of a new button next to [Buy] called [Make an Offer] where the customer can make an offer for a number – we would still collect all contact information as well as offer amount but not take any payment details. Once engaged, you will need to access our existing site to copy it to a new site under a new domain that we will live you to build and work on work and then copy back to the live site once all working.