Add customer management

internal_frontend/services/customers/usecases/validateCustomer.ts

@@ -0,0 +1,15 @@
+"use server";
+
+import {callApi} from "@/lib/api/callApi";
+import {Customer} from "@/app/customers/page";
+import {customerRoutes} from "@/app/api/customers/customerRoutes";
+
+export async function validateCustomer(input: {
+    email: string;
+    companyName: string;
+    street: string;
+    zip: string;
+    city: string;
+}): Promise<Customer[]> {
+    return await callApi<Customer[]>(customerRoutes.validate, "POST", input);
+}