chore: Add free trial alert to our customers slack channel

apps/dashboard/app/api/webhooks/stripe/route.ts

@@ -73,10 +73,70 @@ export const POST = async (req: Request): Promise<Response> => {
       });
       break;
     }
+    case "customer.subscription.created": {
+      const sub = event.data.object as Stripe.Subscription;
+
+      // Only handle trial subscriptions
+      if (!sub.trial_end) {
+        return new Response("OK");
+      }
+
+      // Get product and price information
+      const price = await stripe.prices.retrieve(sub.items.data[0].price.id);
+      const product = await stripe.products.retrieve(price.product as string);
+      const customer = (await stripe.customers.retrieve(sub.customer as string)) as Stripe.Customer;
+
+      const formattedPrice = new Intl.NumberFormat("en-US", {
+        style: "currency",
+        currency: "USD",
+      }).format(price.unit_amount! / 100);
+
+      await alertSlack(product.name, formattedPrice, customer.email!, customer.name!);
+      break;
+    }
 
     default:
-      console.error("Incoming stripe event, that should not be received", event.type);
+      console.warn("Incoming stripe event, that should not be received", event.type);
       break;
   }
   return new Response("OK");
 };
+
+async function alertSlack(
+  product: string,
+  price: string,
+  email: string,
+  name?: string,
+): Promise<void> {
+  const url = process.env.SLACK_WEBHOOK_CUSTOMERS;
+  if (!url) {
+    return;
+  }
+
+  await fetch(url, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      blocks: [
+        {
+          type: "section",
+          text: {
+            type: "mrkdwn",
+            text: `:bugeyes: New customer ${name} signed up for a two week trial`,
+          },
+        },
+        {
+          type: "section",
+          text: {
+            type: "mrkdwn",
+            text: `A new trial for the ${product} tier has started at a price of ${price} by ${email} :moneybag: `,
+          },
+        },
+      ],
+    }),
+  }).catch((err: Error) => {
+    console.error(err);
+  });
+}