rename /user/ to /agent/ and update links to use agent/ instead

agent/js/autopay_setup_stripe.js

@@ -0,0 +1,23 @@
+// Initialize Stripe.js
+const stripe = Stripe(document.getElementById("stripe_publishable_key").value);
+
+initialize();
+
+// Fetch Checkout Session and retrieve the client secret
+async function initialize() {
+    const fetchClientSecret = async () => {
+        const response = await fetch("/client/post.php?create_stripe_checkout", {
+            method: "POST",
+        });
+        const { clientSecret } = await response.json();
+        return clientSecret;
+    };
+
+    // Initialize Checkout
+    const checkout = await stripe.initEmbeddedCheckout({
+        fetchClientSecret,
+    });
+
+    // Mount Checkout
+    checkout.mount('#checkout');
+}