Google-Synced Fee Management App

I need a lightweight web application that keeps my fee records perfectly in-sync with an existing Google Sheet. The app must let me, as the sole Admin, log in through Google OAuth, view all incoming payments, mark them as received, and automatically push every change back to the sheet in real time... (Budget: ₹1500 - ₹12500 INR, Jobs: API Integration, Docker, Git, Google App Engine, JavaScript, Node.js, OAuth, Python)