Credit card processors take approximately 48 hours to clear a payment before paying out. After you have an appointment your client’s card will be charged for the amount of that appointment.
That charge will remain in your pending balance until it is cleared by the credit card company. You will be paid for the appointment once it is a cleared transaction.
Note: After signing up and using Fons for the first time to receive a payment, it does tend to take a couple of days longer. ACH payments do take the longest to process the first time around usually 5-10 days, but will be faster after you have been processing payments for about a month.