The usa technologies eport might work with the ACW 4/5. I was trying to make it work with a
Hamilton Goldline and I'm recalling that usa technologies tech support said the eport works with the ACW 4/5, but not the goldline. Your friend could call and talk to tech support at usatech. They are helpful. The eport costs about $325 and comes with everything you'll need if it works with the ACW. There is a monthly fee of $7.95 which covers the cost of verizon wireless service and reporting via "usalive". Credit processing on units that average a ticket amount over $5 is $.10 plus 2.51% of the
transaction price. Under $5 average ticket price is 5%. I've had two eports for over 2 years and happy with them. I'm installing them in my ss bays next week.
As MDrost1 said, Cryptopay is an option. I think the cryptopay setup for an ACW is about $1000. Crypotpay requires internet access. I looked pretty hard at cryptopay, but was never able to nail down an exact amount for
credit card processing fees. Best I can tell from feedback on this forum is that the fees average about 5%.