A webhook that monitors Stripe subscription cancellations and sends notifications to Discord.

Set these environment variables:

• stripe_subscriptions_readonly - Your Stripe secret key (starts with sk_)
• STRIPE_WEBHOOK_SECRET - Webhook endpoint secret from Stripe dashboard
• DISCORD_WEBHOOK_URL - Discord webhook URL for notifications

1. Go to your Stripe Dashboard → Webhooks
2. Add a new webhook endpoint pointing to your Val Town HTTP endpoint URL
3. Subscribe to the customer.subscription.updated, customer.subscription.updated, customer.updated event
4. Copy the webhook signing secret to your environment variables

• Sends Discord notification when a subscription is cancelled
• Includes customer email, subscription details, amount, and cancellation reason
• Sends follow-up message with customer feedback if provided