Ordering system correction

This is a php programming optimisation order for OS Commerce Website [login to view URL] Situation: Costumers first can create their stamp motiv either through Text creation ([login to view URL]) or through graphic upload ([login to view URL]) and include the ordered product in the shopping_cart.php. Problems / Modification: 1. After including the orders (product) in the [login to view URL] the customer either login or creates a new account in case it is a new customer. Hereby the problems occurs that the temporary data (stamp motiv) gets lost after registration; between [login to view URL] and [login to view URL] [login to view URL] 2. In case a customer pays threw credit cart (Paypal), the order email is not provided with Invoice, delivery note and Stamp motive as attachment; also input text creation and information is missing in the Email text. 3. Further also the stamp motive is not saved in the folder finished_stamps 4. In case the customer includes a different delivery address as the invoice address; the delivery address is not included in the delivery note (pdf); the invoice address remains. 5. Affiliate Program, in case the passwort is forgotten and requested again following mistake accures: [login to view URL] Invalid address: Invalid address: Warning: Cannot modify header information - headers already sent by (output started at /srv/www/vhosts/[login to view URL]:501) in /srv/www/vhosts/[login to view URL] on line 33 Important: As this website is online / Running; Backup of existing pages should be guaranteed. Also any updates and implmentation should be done without assecting the running website. Own ordering testings can be done; Communication: Preferred comunication tool is Skype.