How can we manually enter a payment using their credit card information for a customer in Commerce?
Create the order in the admin UI and add the user as the first step of creating the order.
Save the order.
Go to People and then edit the user you just created.  Add payment info.
Then add shipping info in the orders &gt; shipments tab (if you have a shippable product).
Then go to Orders &gt; Payments and you should be able to add the payment that you just added and make the charge (if cc).
Then edit the order and place the order.

Maybe there is an easier way to do this but so far these are the bizarre steps I am going through.