Automated Google Sheet Tracker

I need a single Google Sheet that automatically captures and organises three data streams—Mail enquiries, Purchase orders and Inventory levels—in one combined view with clearly labelled columns. No manual entry should be required; the information must flow in through an automated process... (Budget: ₹600 - ₹1500 INR, Jobs: API, Automation, Google App Engine, Google Chrome, Google Sheets, PHP, Software Architecture, Zapier)