Tour Booking Shop with paypal & SumUp

implementing a webshop for Tour booking in a existing website. Customer should choose a free Slot in a calendar and a Product/Service 30 Min/60 Min/ 90 Min/ 120 Min. Time overlapping booking should not be possible.
Direct buying of gift cards without calendar Slot should be possible.

Frontend:
- Design: Implemented in a existiert website - Design bootstrap

- Webshop for direct booking rikshaw services
customer can register or buy as Guest (without registering)

- Products:
a) Book a free Slot in Calendar "direct booking", different tours (products)
b) buy a gift card (not combined with a time slot)

- Payment: paypal, SumUp and "pay by bill"/advanced payment

- SEO optimized

- english or german language, if english I can translate it later to german by myself
Mandatory fields:
firstname, lastname, address, zip Code, City, phone number, emailaddress
not mandatory fields:
assign Newsletter, Comment

Backend:
- Login as admin

- manage free/available slots in Calendar

- Newsletter would be fine

- add/modify products (Services/Tour)


Implementing of opencart or similar is OK, no license costs for Shop or payment Services!
No app, all web based. experience with SumUp API required.
Projekt should be finish within 2 weeks