Google App for Business Inventory Management

I'm in need of a Google app specifically designed for my business production and e-commerce stock handling. This should be more than a simple product catalog, it needs to meet the following requirements: - Order Management: Proposal should detail how the app will effectively handle and manage orders. - Inventory Management: The app must accurately monitor and manage inventory levels. - System Integration: I already use a system for managing orders and inventory. I need this new app to fully integrate with it. Ideal freelancers should have a background in creating Google apps, preferably with experience in e-commerce and inventory systems. Knowledge of system integration is a must.