Rezervy is great PHP script for online booking solution with multi step booking form and single page booking form features . Ability to choose form design from backed is given. Rezervy provide option to add category, services, add-ons , staff members with integrated list of online popular payment gateways and sms gateways.
Original script and Demo: https://codecanyon.net/item/rezervy-online-appointment-reservation-booking-calendar/25076328
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