Your customers can send you requests. When they do, the customer service email address you have set in their rate plan will be notified. You can then log in to the Enswitch web interface, go to the Commerce » Requests menu, and view and approve or reject the requests.
In the current version of Enswitch, the only type of request is an account top up using credit card. If your Enswitch system has automatic credit card facilities, these need no action on your part. If not, a request will be sent you. The requested amount and the customer's credit card details will be shown in the request. You should process this using your external credit card system. When done, you can approve or reject the request. An email will then be sent to the customer with the status of the request and your comments. If you have approved the request, the customer's balance is automatically increased by the requested amount.