I still need to be able to receive the order as if its a normal order. I just don't need to accept payment. So I setup a "Manual payment method" which shows up during checkout. They can select it. But I can't also turn off credit cards. When I try to Manage Shopify Payments to deselect everything it says I need at least one. I don't want one.
Olivia here from the Shopify Team.
I came across this thread and I wanted to make sure there were no further questions in regards to the set-up you are seeking.
It's totally possible to use Shopify without using our platform to transact funds via credit card as you have figured out, @lostinspace.
Step 1 Disable Shopify Payments
Step 2 Enable Manual Payments
This way the order will come in as per normal, and you can still fulfill as you need to. Let us know if you have any further requirements for your custom set-up and I'd love to help you figure out a solution.