Fintech Surcharge Integration System

I’m looking for a streamlined way to add surcharges directly inside the accounting flow we already use. The task is to build a smart module that hooks into both QuickBooks and Xero, applies either percentage-based... (Budget: ₹400 - ₹750 INR, Jobs: Accounting, API Development, Docker, GraphQL, OAuth, REST API, Software Architecture, Xero)