Semi automated shopping basket plug in needed with a manual stock clearance

Hi
I’m trying to find a way in which customers can place orders with an automated shopping basket that records the parts number, quantity and enter payment method (credit/cash card, paypal or other). The sistem then will place a request but wait to take payment or act on the order until a stock check is done manually at the workshop. If parts are available then accept payment and proceed to shipp, if not, answer wit time estimate for availability.

I’m building a wp website for a friend. He machines small metal parts for music instruments and have a very extensive catalogue (makes nuts, bolts, pegs, keys, tone rings… reproduction parts of old american instruments, lots of fiddly little bits in all sort of shapes, metals and finishes wich makes the parts list endless and production, machine setting and calibration a nightmare). It’s a hobby-industry for the love of these instruments aside of the main business. He can’t afford to have someone taking telephone orders or checking complicated email orders written ad-hoc by customers ordering half a dozen bolts no one has ever made since 1880!).

Any idea about any shopping cart / shopping basket plug ins that could be configured like this?

Thanks a lot.