Add Paynet (Moldova) payment gateway
PaymentSettings:
- New "🇲🇩 Paynet" section: enabled toggle, mode (test/live), merchant_code,
service_id, user, password, secret (HMAC), webhook URL hint
- Webhook URL: https://service.mir.md/payments/paynet/webhook
PaymentController:
- startPaynet() — builds Paynet redirect (stub mode prints flow)
- paynetWebhook() — verifies HMAC-SHA256 signature canonical
Merchant_Code|Order_ID|Amount|Status, marks subscription paid on Status=OK,
matches by invoice_number = Order_ID
- availableMethods() includes paynet
Tenant /billing:
- 4th payment button "🇲🇩 Paynet" — visible only when configured.
Description: Card MAIB / MICB / Victoriabank, MD Cash, e-money
Routes:
- POST /payments/paynet/webhook (CSRF excluded)
Vasyka
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