When you set up merchant solutions, approximately how much do you pay monthly?

Question

It includes the shopping cart, editing the shopping cart, form of payment (meaning credit card of course), and what else?

Answer 1

Shopping cart is something you can get for free (there are plenty of open-source scripts). Credit card processing fees vary by processor. There may or may not be a setup fee and/or a monthly fee; there definitely will be a per-transaction fee, which some processors assess as a fixed amount, others, as a percentage of transaction value, and yet others, as a combination of the two.