X-Admin-Key header.CARBIDS_LEAD_WEBHOOK to forward each lead automatically.https://yourdealership.com/inventory — pulls specs & photos, no credentials.ftp://user:pass@host:21/export/ — grabs the newest file in that folder.ftps://user:pass@host:21/export/feed.csv — an exact file over TLS.price_1AbC…).STRIPE_SECRET_KEY (from Stripe → Developers → API keys), and one price per tier: STRIPE_PRICE_PRO, STRIPE_PRICE_ELITE, STRIPE_PRICE_UNLIMITED.POST /api/stripe/webhook, subscribe it to checkout.session.completed and customer.subscription.*, then set the signing secret as STRIPE_WEBHOOK_SECRET. This keeps each dealer's plan (and listing cap) in sync automatically.sk_test_… key and test price IDs to try checkout with Stripe's test card 4242 4242 4242 4242; switch to the sk_live_… key when ready. Intro pricing can also be a Stripe coupon/promo code — checkout already accepts promo codes.