MekongMind uses Polar.sh for subscription management, checkout, and webhook handling.

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How It Works

  1. User subscribes via Polar.sh checkout
  2. Polar sends a webhook to MekongMind
  3. Credits are allocated to the user’s account
  4. Usage is metered and tracked
  5. Webhook notifications on subscription updates/cancellations

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Webhook Endpoint

POST /api/billing/webhook
Handles:
  • subscription.created — allocate initial credits
  • subscription.updated — adjust tier/credits
  • subscription.cancelled — revoke access
  • payment.succeeded — top-up credits

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Security

All webhooks are verified using Polar.sh’s HMAC signature. Invalid signatures are rejected.