Build me an website + mobile app

Multivendor Marketplace. Only for appointments outcall/incall depends on profession (for example - house cleaning, gardener, physiotherapist, etc.). The vendor should just be able to offer appointments. General Page with categories, search function and filter option and multiple offers (for example 5 in a row for the website, one after another for mobile app). The booking page should look like a profile with rating and comment section. Payment integration (with the option to set up a fee which is transferred to the agency and the rest transferred to the vendor). Payment to the vendor on hold until a QR code is scanned at the start of the appointment (for security reason - that the vendor and customer confirm the start of the appointment - vendor should get the QR Code - Customer has to scan and confirm - then payment from agency account to vendor minus the agency fee). Cash payment at appointment only with a agency fee that has to be payed online when booking.