Polygon (Matic) Crypto - generate Public/Private key address (Wallet program) - Consultation

We are developing a polygon web application. When a user clicks 'top up' within the application, a wallet program should generate Matic(Polygon) public and private keys.

We need a polygon expert to point us to programs/APIs on how to generate the Public/Private keys. This is a consultation project. The developer need not write any code for the project.