Step 5: Set up your shopping cart. You’ll need to integrate your shopping cart (where your users sign up) with your merchant processing account(s) and your NATS installation. This one isn’t so cookie cutter. I can refer you to a programmer/designer once you get to this step. I used Rob Murray every time. I asked him and he said you are welcome to reach out to him at firstname.lastname@example.org when you are ready for this step. This step not particularly hard for any developer to handle, but you’ll need a developer if you are not savvy with web dev. You’ll have to ask Rob or your developer their price, but I think I remember the cost being around $200.