I have a fairly complex product catalog system written in PHP/MySQL that I need to extend by adding a shopping cart, payment validation and processing, order confirmation, etc. The hosting account on which this site is running supports Miva Merchant, which will support various forms of payment validation and processing.
I see several options:
(Desired) Pass the catalog/pricing information from MySQL catalog database into a Miva shopping cart, then configure Miva to do the rest.
(Probably better) Load up a shopping cart using PHP, then pass the order information to Miva to let it process payment, etc.
(Much to learn and do) Do it all using PHP.
(Forget this option! I won't do it.) Rebuild in MivaScript.
Any suggestions, resources, guides, experiences would be greatly appreciated.