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Core environment

Typical self-hosted .env values: 
DB_HOST=localhost
DB_PORT=3306
DB_USER=sendy_user
DB_PASS=your_password
DB_NAME=sendy_database

SENDYKIT_LICENSE_KEY=sk_lic_xxxxxxxxxxxxx
SENDYKIT_STORE_URL=https://sendykit.dev

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Database rule

SendyKit uses the same MySQL database as Sendy. Use the credentials from Sendy’s includes/config.php unless you have intentionally separated access. For current billing/machine-payment behavior, the main switches are: 
SENDYKIT_PAYMENT_SECRET=change-me
STRIPE_SECRET_KEY=sk_live_...
STRIPE_WEBHOOK_SECRET=whsec_...
SENDYKIT_ENFORCE_STRIPE_MACHINE_PAYMENT=true

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Offline mode

If you need an isolated or air-gapped mode: 
SENDYKIT_OFFLINE=true
That disables phone-home behavior and metered remote services. After changing config: 
sendykit health
sendykit doctor
That catches broken DB credentials, missing services, and readiness issues faster than guessing.