Sales Order App Syncing TallyPrime

I want a lightweight application that lets my team key-in customer sales orders and have those orders appear in TallyPrime without any manual export-import steps. The same link should also pull live data from TallyPrime so that, while creating an order, my staff can choose from the current customer list, see every item with its price, available stock, and even the customer’s outstanding balance. In short, everything they need to confirm quantities and payment terms is already on-screen, and once they hit “Save” the order is instantly (or on a short poll/queue) written back to TallyPrime as a proper Sales Order voucher.

Key expectations
• Two-way sync: customers, items, prices, stock, and balances flow into the app; completed sales orders flow back into TallyPrime.
• Staff-entered orders only; no public portal required.
• Clean, intuitive UI that runs reliably on the devices you recommend (web, desktop, or mobile—open to what delivers the smoothest TallyPrime integration).
• Source code, deployment guide, and a brief hand-over session form the completion criteria.

If you have prior experience integrating with TallyPrime’s API/ODBC/XML gateways or writing TDL connectors, please highlight it—the smoother the sync, the better.