For an Ionic app: To create a link to a backend system so that I can receive orders and save these in a database

Ionic app: to create a link to a backend system so that I can receive orders and save these in a database. The following functions I need in the backend system: Login, register, logout, cart, my account page, order details, payment gateway, static pages, product categories, products, product details & discount & promotions.

EU only.