SimpleClinic allows you to store credit card details with a payment gateway.
You will first need to ensure you are signed up and connected to either payment gateway through Business Setup -> Integrations.
Once done, you will be to add credit card details to the patient file. You can do this by going to Patients -> Select a patient record.
Click the Payment Details section -> Click ADD -> Select the payment gateway -> Enter cardholder and card details -> Click save.
Once done, you can charge the stored details by raising an invoice -> adding items to the invoice -> Payments + -> In Method, choose the Card Ending XXXX option -> OK.