The official JazzCash App is Pakistan’s leading mobile wallet for finance and lifestyle, providing secure money transfers, bill payments, and QR shopping. While third-party developers offer JazzCash clone scripts
Official JazzCash customer service cannot help you if money is lost through an unofficial app.
I can provide or regulatory checklists based on your needs.
Instead of competing with JazzCash, become their reseller. JazzCash has an program for developers. You can build a "Super App" that uses JazzCash as the payment rail. This is 100% legal and free to start via the JazzCash Developer Portal (Sandbox environment).