Using credit accumulated in Membership to book an appointment

In Appointments+ I have create a booking system for consultations and set up Paypal payment. People who pay regularly into a club will need discounts, so have used Membership plugin to do this and have linked it to Appointments+. The Paypal account specified in Membership is linked to a bank account and money accumulated in Paypal will be drawn into this account. Is there any way that members can use their accumulated funds to pay for an appointment using these combined plugins?