How do I Decrypt AES key (“session_key” from request Json) using Client RSA Private key in php

Question

I have this encrypted authentication request.

{ "data":"3UsYDGma9CiIbhNa3aZZYoC0tPU9Uui1tpkvu33IOKya8UNXpo4mOL2BGTYogYoax7RP2kQzQM+xoUoC", "h