- Finish updating URLs from /portal to /client

- Add a basic Stripe management page to admin settings to remove cards/reset Stripe customer IDs

js/autopay_setup_stripe.js

@@ -6,7 +6,7 @@ initialize();
 // Fetch Checkout Session and retrieve the client secret
 async function initialize() {
     const fetchClientSecret = async () => {
-        const response = await fetch("/portal/portal_post.php?create_stripe_checkout", {
+        const response = await fetch("/client/post.php?create_stripe_checkout", {
             method: "POST",
         });
         const { clientSecret } = await response.json();