You can set up automatic payments by enabling Auto Top-Ups. Enabling Auto Top-ups will automatically increase your account balance by your top-up amount when your account balance falls below the balance threshold.
From there, if you haven't added a payment method yet, you can add a card to the Auto Top-Ups section.
Once you have added your card, select it from the drop-down menu. Then you can set your threshold and auto top-up amount. The minimum amount for both the threshold and auto top-up is $10.00.
After you click "save Top-Up settings", you should receive a confirmation email with the subject line "OpenCNAM Automatic Payments Activated."
Every time you automatically make a payment you will receive a receipt via email. You will also see your payment history on the Payments & Billing page