Before doing a payments call where you setup Clovers with a customer, you should log into their Dash database and ensure that the Payment Provider is set up and the "Select a Terminal" field shows up in the Checkout page.
If the "Select a Terminal" field does not show in the Checkout screen, it likely means that the customer's Clovers were sent out with the wrong API key. This is something that CardPointe Support needs to fix, and they can do so remotely.
Create a SalesForce ticket with CardPointe Support included ([email protected]) using the "Wrong API Key" macro. Make sure to insert the MID and HSN number(s) for the customer and affected Clover device(s).
Typical turnaround time for this is 24 hours. The devices should then be ready to use, after going through the Clover Installation process. The Clover(s) may need to be restarted after the API key correction if they are not working right away. Though, usually the restart is not required.