Add Lemon Squeezy Billing System

packages/billing/lemon-squeezy/src/schema/lemon-squeezy-server-env.schema.ts

@@ -0,0 +1,14 @@
+import { z } from 'zod';
+
+export const getLemonSqueezyEnv = () =>
+  z
+    .object({
+      secretKey: z.string().min(1),
+      webhooksSecret: z.string().min(1),
+      storeId: z.number().positive(),
+    })
+    .parse({
+      secretKey: process.env.LEMON_SQUEEZY_SECRET_KEY,
+      webhooksSecret: process.env.LEMON_SQUEEZY_WEBHOOK_SECRET,
+      storeId: process.env.LEMON_SQUEEZY_STORE_ID,
+    });