Usage:
  php tools/setup_daraja_relay.php <relay_url> <token>

Example:
  php tools/setup_daraja_relay.php http://169.58.31.10/daraja-relay.php 30b1ec07ad5f23577371a92022c85ad5

Current settings:
  mpesa_daraja_relay_url:   https://net.pamnetsolutions.co.ke/upload/daraja-relay.php
  mpesa_daraja_relay_token: (set)