Add Lemon Squeezy Billing System

packages/billing/gateway/src/server/services/billing-gateway/billing-gateway-provider-factory.ts

@@ -0,0 +1,31 @@
+import { getSupabaseServerActionClient } from '@kit/supabase/server-actions-client';
+
+import { BillingGatewayService } from './billing-gateway.service';
+
+/**
+ * @description This function retrieves the billing provider from the database and returns a
+ * new instance of the `BillingGatewayService` class. This class is used to interact with the server actions
+ * defined in the host application.
+ */
+export async function getBillingGatewayProvider(
+  client: ReturnType<typeof getSupabaseServerActionClient>,
+) {
+  const provider = await getBillingProvider(client);
+
+  return new BillingGatewayService(provider);
+}
+
+async function getBillingProvider(
+  client: ReturnType<typeof getSupabaseServerActionClient>,
+) {
+  const { data, error } = await client
+    .from('config')
+    .select('billing_provider')
+    .single();
+
+  if (error ?? !data.billing_provider) {
+    throw error;
+  }
+
+  return data.billing_provider;
+}