Create a PowerApp Purchase Requisition application for desktop/tablet that provides an online shopping experience. Application will consume oData feed from Microsoft Dynamics 365 application. App will provide similar "Amazon" shopping experience. Authenticated user can browse categories and select products / services to add to their cart. Checkout will create D365 Requisition records that will simulate checkout experience. You will be working with D365 consultant who can provide information on data model but does not have necessary PowerApp experience.