Mobile App prototype/mockup for health-tech startup

The proposed platform will be an e-commerce service connecting clients with qualified providers. Clients are individuals who require assistance for a patient, (end-user) and will purchase services from qualified providers who can act as individual providers or through a company with their employees.
For face-to-face services, the platform will need to have a booking, order generation, confirmation, tracking of service delivery, and invoicing capabilities. For video/audio conferencing services, third-party APIs may be utilized to facilitate communication, and for phone consultations, the system will have the ability to track orders, invoices, and delivery.