Use Case #4. Thin client back-office
You have a back-office that works in a browser. That back-office can access data inside srv4pos.com.
To manage taxes, categories, products and commodities data see Use Case #1. Simple Articles consumer and Use Case #2. Simple Articles provder.
Sales analytics API is available by this API:
Per product category:
Per cash register:
Detailed (per receipt):
Basic POS management is presented as list of cash registers by calling GET /registrations (getRegistrationList()) . API of advanced POS management, such add new POS in run-time is presented at API keys page.