[ON]  mpesa_enabled=1
[OFF] mpesa_demo_mode=0  (real STK only)
[ENV] mpesa_env=live
[OK] Credentials present — real STK Push will be used.
demoMode=no
Portal buy: https://pamnetsolutions.co.ke/isp-billing/tools/public/portal/packages
Callback:   https://pamnetsolutions.co.ke/isp-billing/tools/public/payments/mpesa-callback