Cara pasang di dashboard payment gateway:
Midtrans:

Dashboard Midtrans > Settings > Notification URL: https://infohadir.com/payment_callback.php?gateway=midtrans
Ganti SB-Mid-server-xxx di file dengan Server Key asli kamu
Xendit:

Dashboard Xendit > Settings > Callback URL: https://infohadir.com/payment_callback.php?gateway=xendit
Token callback: xendit_callback_token_xxx
Ganti API Key di file