Add handler for readiness probe

README.md

@@ -31,6 +31,7 @@ npm run build
 
 | Event | Action | Template |
 | -------------------------- | ----------------------------------- | ---------------------- |
+| `readiness.probe`          | API checking on readiness           | -                      |
 | `integrations.create`      | Initial setup                       | -                      |
 | `orders.create`            | Send customer receipt               | "Order receipt"        |
 | `orders.physical.shipment` | Send customer shipment notification | "Item shipped"         |

index.js

@@ -67,6 +67,14 @@ module.exports = async function handler(request, context) {
   // Verify webhook authenticity
   verifyWebhook(request.body, context.webhookSigningKey);
 
+  // If it's a readiness probe, tell it we're good.
+  if (request.body.event === 'readiness.probe') {
+    return {
+      statusCode: 204,
+      body: '',
+    };
+  }
+
   // Fetch merchant and integration info
   const merchant = await context.merchant();
   const merchantId = merchant.id;