diff --git a/src/components/dashboard/DashboardSubscription.tsx b/src/components/dashboard/DashboardSubscription.tsx
index 4b7bac0..1c8e584 100644
--- a/src/components/dashboard/DashboardSubscription.tsx
+++ b/src/components/dashboard/DashboardSubscription.tsx
@@ -166,7 +166,30 @@ const DashboardSubscription: React.FC<DashboardSubscriptionProps> = ({ user, pla
                                 Obtenha análises ilimitadas, histórico completo e acesso às funcionalidades profissionais.
                             </p>
                         </div>
-                        <button className="bg-white hover:bg-gray-100 text-gray-900 font-bold px-8 py-3 rounded-xl transition-all shadow-lg hover:shadow-xl hover:-translate-y-0.5 whitespace-nowrap">
+                        <button
+                            onClick={async () => {
+                                try {
+                                    const { data: { session } } = await supabase.auth.getSession();
+                                    if (!session) return alert("Faça login novamente");
+
+                                    const res = await fetch(`${import.meta.env.VITE_SUPABASE_URL}/functions/v1/stripe-checkout`, {
+                                        method: "POST",
+                                        headers: {
+                                            "Content-Type": "application/json",
+                                            "Authorization": `Bearer ${session.access_token}`,
+                                        },
+                                        body: JSON.stringify({ plan: "mensal" }) // Default to monthly
+                                    });
+
+                                    const { url, error } = await res.json();
+                                    if (error) throw new Error(error);
+                                    if (url) window.location.href = url;
+                                } catch (e) {
+                                    alert("Erro ao iniciar checkout: " + e);
+                                }
+                            }}
+                            className="bg-white hover:bg-gray-100 text-gray-900 font-bold px-8 py-3 rounded-xl transition-all shadow-lg hover:shadow-xl hover:-translate-y-0.5 whitespace-nowrap"
+                        >
                             Fazer Upgrade Agora
                         </button>
                     </div>
diff --git a/src/pages/Dashboard.tsx b/src/pages/Dashboard.tsx
index f82c54c..bb5f6c1 100644
--- a/src/pages/Dashboard.tsx
+++ b/src/pages/Dashboard.tsx
@@ -95,7 +95,7 @@ const Dashboard: React.FC<DashboardProps> = ({ user, onLogout, onOpenAdmin, onOp
         return;
       }
 
-      const response = await fetch(`${import.meta.env.VITE_SUPABASE_URL}/functions/v1/stripe-checkout`, {
+      const response = await fetch(`${import.meta.env.VITE_SUPABASE_URL}/functions/v1/stripe-portal`, {
         method: "POST",
         headers: {
           "Content-Type": "application/json",
diff --git a/supabase/functions/stripe-portal/index.ts b/supabase/functions/stripe-portal/index.ts
new file mode 100644
index 0000000..c30b5a3
--- /dev/null
+++ b/supabase/functions/stripe-portal/index.ts
@@ -0,0 +1,72 @@
+
+/// <reference lib="deno.ns" />
+import Stripe from "npm:stripe@16.12.0";
+
+const STRIPE_SECRET_KEY = Deno.env.get("STRIPE_SECRET_KEY") ?? "";
+const SUPABASE_URL = Deno.env.get("SUPABASE_URL") ?? "";
+const SUPABASE_ANON_KEY = Deno.env.get("SUPABASE_ANON_KEY") ?? "";
+const SITE_URL = Deno.env.get("SITE_URL") ?? "http://localhost:3000";
+
+const stripe = new Stripe(STRIPE_SECRET_KEY, { apiVersion: "2025-11-17.clover" });
+
+const corsHeaders = {
+    "access-control-allow-origin": "*",
+    "access-control-allow-headers": "authorization, x-client-info, apikey, content-type",
+    "access-control-allow-methods": "POST, OPTIONS",
+};
+
+function json(data: unknown, status = 200) {
+    return new Response(JSON.stringify(data), {
+        status,
+        headers: { "content-type": "application/json", ...corsHeaders },
+    });
+}
+
+async function getUserFromJwt(jwt: string) {
+    const res = await fetch(`${SUPABASE_URL}/auth/v1/user`, {
+        headers: {
+            apikey: SUPABASE_ANON_KEY,
+            authorization: `Bearer ${jwt}`,
+        },
+    });
+    if (!res.ok) return null;
+    return await res.json();
+}
+
+async function getStripeCustomerId(userId: string) {
+    const res = await fetch(`${SUPABASE_URL}/rest/v1/stripe_customers?user_id=eq.${userId}&select=stripe_customer_id`, {
+        headers: {
+            apikey: SUPABASE_ANON_KEY,
+            authorization: `Bearer ${SUPABASE_ANON_KEY}`,
+        },
+    });
+    if (!res.ok) return null;
+    const rows = await res.json();
+    return rows?.[0]?.stripe_customer_id;
+}
+
+Deno.serve(async (req) => {
+    if (req.method === "OPTIONS") return new Response("ok", { headers: corsHeaders });
+    if (req.method !== "POST") return json({ ok: false, error: "Method not allowed" }, 405);
+
+    try {
+        const auth = req.headers.get("authorization") || "";
+        const jwt = auth.startsWith("Bearer ") ? auth.slice(7) : "";
+        if (!jwt) return json({ ok: false, error: "Missing Authorization" }, 401);
+
+        const user = await getUserFromJwt(jwt);
+        if (!user?.id) return json({ ok: false, error: "Invalid token" }, 401);
+
+        const customerId = await getStripeCustomerId(user.id);
+        if (!customerId) return json({ ok: false, error: "Customer not found" }, 404);
+
+        const session = await stripe.billingPortal.sessions.create({
+            customer: customerId,
+            return_url: `${SITE_URL}/dashboard`,
+        });
+
+        return json({ ok: true, url: session.url });
+    } catch (err) {
+        return json({ ok: false, error: String((err as any)?.message ?? err) }, 500);
+    }
+});