Registers on the togo payment.PaymentProvider interface and is selected via
PAYMENT_DRIVER=fawry. Gateway API calls are scaffolded — see the Fawry docs.
Package fawry is a Fawry (Egypt) driver for togo payment. Set
PAYMENT_DRIVER=fawry + FAWRY_MERCHANT_CODE + FAWRY_SECURITY_KEY. Optional
FAWRY_BASE_URL (default: live; use https://atfawry.fawrystaging.com for sandbox).
Requests are signed with SHA-256 over a documented field concatenation +
the security key; webhook notifications are verified the same way.