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ShipPeek uses webhooks to automate account provisioning when new users sign up through payment platforms.

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Polar webhooks

When a user completes a purchase through Polar, ShipPeek automatically:
  1. Creates a new user account
  2. Generates API credentials (client ID + client secret)
  3. Configures default surcharge settings
  4. Sends a welcome email with API credentials via Resend
This process is fully automated — no manual account setup required.

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Webhook endpoint

This endpoint is not authenticated via Bearer token. Instead, it verifies webhook signatures to ensure requests originate from Polar.

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Event flow

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Webhook security

  • Webhook payloads are verified using the Polar webhook signing secret
  • The endpoint is not accessible with standard API authentication
  • Failed signature verification returns 401
Webhook processing is idempotent. Duplicate webhook deliveries for the same event do not create duplicate accounts.

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Testing webhooks

In development, use the Polar sandbox environment to trigger test webhook events. Configure the webhook URL to point to your local development server or a tunnel service.