I have been searching here and there, came across many form plugins and store payment plugins, but Im looking for a system that would let me do both things at once: a form+shopping cart plugin.
Im looking to build an order system similar to this brilliant system on their order page(without the spaces):
www dot writemyessay dot com/custom-writing/
It is a form that lets you specify how many pages of writing you need and then based on the due date, uses a rate to calculate a total and lets you check out immediately...
Im hanging my - cannot find something like this .... any help please??