B2B-88: add starter kit structure and elements

packages/billing/lemon-squeezy/src/services/create-lemon-squeezy-billing-portal-session.ts

@@ -0,0 +1,24 @@
+import { getCustomer } from '@lemonsqueezy/lemonsqueezy.js';
+import { z } from 'zod';
+
+import type { CreateBillingPortalSessionSchema } from '@kit/billing/schema';
+
+import { initializeLemonSqueezyClient } from './lemon-squeezy-sdk';
+
+/**
+ * Creates a LemonSqueezy billing portal session for the given parameters.
+ *
+ * @param {object} params - The parameters required to create the billing portal session.
+ */
+export async function createLemonSqueezyBillingPortalSession(
+  params: z.infer<typeof CreateBillingPortalSessionSchema>,
+) {
+  await initializeLemonSqueezyClient();
+
+  const { data, error } = await getCustomer(params.customerId);
+
+  return {
+    data: data?.data.attributes.urls.customer_portal,
+    error,
+  };
+}