Lemon Squeezy Webhook Confirmation Email with Rovela (2026): X-Signature + Idempotency-Key
Verify Lemon Squeezy X-Signature on the raw body, handle order_created / subscription_created, and send branded confirmations via Rovela POST /emails with Idempotency-Key = ls-order_created-{id} or ls-subscription_created-{id}. Lemon Squeezy owns checkout; Rovela delivers. Distinct from Stripe and Shopify webhook posts.