B2B-88: add starter kit structure and elements

packages/billing/stripe/src/schema/stripe-server-env.schema.ts

@@ -0,0 +1,39 @@
+import { z } from 'zod';
+
+export const StripeServerEnvSchema = z
+  .object({
+    secretKey: z
+      .string({
+        required_error: `Please provide the variable STRIPE_SECRET_KEY`,
+      })
+      .min(1),
+    webhooksSecret: z
+      .string({
+        required_error: `Please provide the variable STRIPE_WEBHOOK_SECRET`,
+      })
+      .min(1),
+  })
+  .refine(
+    (schema) => {
+      const key = schema.secretKey;
+      const secretKeyPrefix = 'sk_';
+      const restrictKeyPrefix = 'rk_';
+
+      return (
+        key.startsWith(secretKeyPrefix) || key.startsWith(restrictKeyPrefix)
+      );
+    },
+    {
+      path: ['STRIPE_SECRET_KEY'],
+      message: `Stripe secret key must start with 'sk_' or 'rk_'`,
+    },
+  )
+  .refine(
+    (schema) => {
+      return schema.webhooksSecret.startsWith('whsec_');
+    },
+    {
+      path: ['STRIPE_WEBHOOK_SECRET'],
+      message: `Stripe webhook secret must start with 'whsec_'`,
+    },
+  );