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frontend/src/pages/subscribe/CheckoutReturn.jsx

@@ -0,0 +1,54 @@
+import { useState, useRef } from "react";
+import { useParams, useNavigate } from "react-router-dom";
+import { verifyCheckoutSession } from "../../api/stripe";
+import { useAuth } from "../../contexts/AuthContext";
+import "./Subscribe.css";
+
+export default function CheckoutReturn() {
+  const { sessionId } = useParams();
+  const navigate = useNavigate();
+  const { refreshAccount } = useAuth();
+  const [error, setError] = useState(null);
+  const started = useRef(false);
+
+  if (sessionId && !started.current) {
+    started.current = true;
+    verifyCheckoutSession(sessionId)
+      .then(() => refreshAccount())
+      .then(() => navigate("/addresses", { replace: true }))
+      .catch((err) => setError(err.message || "Payment verification failed"));
+  }
+
+  if (!sessionId) {
+    return (
+      <div className="subscribe">
+        <div className="subscribe__container">
+          <h1 className="subscribe__title">Koin Ping</h1>
+          <div className="alert alert--error">No session ID found.</div>
+          <p><a href="/subscribe">Back to Subscribe</a></p>
+        </div>
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="subscribe">
+        <div className="subscribe__container">
+          <h1 className="subscribe__title">Koin Ping</h1>
+          <div className="alert alert--error">{error}</div>
+          <p><a href="/subscribe">Try again</a></p>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="subscribe">
+      <div className="subscribe__container">
+        <h1 className="subscribe__title">Koin Ping</h1>
+        <p>Verifying your payment...</p>
+      </div>
+    </div>
+  );
+}

frontend/src/pages/subscribe/Subscribe.jsx

@@ -1,9 +1,8 @@
-import { useState, useEffect } from "react";
+import { useState } from "react";
 import { useNavigate, useSearchParams } from "react-router-dom";
 import { useAuth } from "../../contexts/AuthContext";
 import {
-  createOnboardingCheckout,
-  verifyCheckoutSession,
+  createCheckoutSession,
   activateFreeTier,
 } from "../../api/stripe";
 import Input from "../../components/Input";
@@ -13,6 +12,74 @@ import "./Subscribe.css";
 
 const STEPS = ["Create Account", "Choose Plan"];
 export default function Subscribe() {
+  const navigate = useNavigate();
+  const [searchParams] = useSearchParams();
+  const { currentUser, signup, refreshAccount } = useAuth();
+
+  const [step, setStep] = useState(currentUser ? 2 : 1);
+  const [data, setData] = useState({
+    email: currentUser?.email || "",
+    password: "",
+    confirmPassword: "",
+    selectedTier: null,
+  });
+  const [error, setError] = useState(
+    searchParams.get("payment") === "cancelled"
+      ? "Payment was cancelled. Please try again."
+      : ""
+  );
+  const [loading, setLoading] = useState(false);
+
+  function set(field, value) {
+    setData((prev) => ({ ...prev, [field]: value }));
+  }
+
+  async function handleStep1() {
+    setError("");
+    if (!data.email || !data.password) {
+      setError("Email and password are required");
+      return;
+    }
+    if (data.password.length < 6) {
+      setError("Password must be at least 6 characters");
+      return;
+    }
+    if (data.password !== data.confirmPassword) {
+      setError("Passwords do not match");
+      return;
+    }
+    setLoading(true);
+    try {
+      await signup(data.email, data.password);
+      setStep(2);
+    } catch (err) {
+      setError(err.message || "Failed to create account");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function handleStep2() {
+    setError("");
+    if (!data.selectedTier) {
+      setError("Please select a plan");
+      return;
+    }
+    setLoading(true);
+    try {
+      if (data.selectedTier === "free") {
+        await activateFreeTier();
+        await refreshAccount();
+        navigate("/addresses", { replace: true });
+      } else {
+        const { url } = await createCheckoutSession(data.selectedTier);
+        window.location.href = url;
+      }
+    } catch (err) {
+      setError(err.message || "Something went wrong");
+      setLoading(false);
+    }
+  }