with backend support

src/app/providers.tsx

@@ -32,9 +32,7 @@ export function Providers({
           backButtonEnabled={true}
         >
           <SafeFarcasterSolanaProvider endpoint={solanaEndpoint}>
-            <AuthKitProvider config={{}}>
+            <AuthKitProvider config={{}}>{children}</AuthKitProvider>
-              {children}
-            </AuthKitProvider>
           </SafeFarcasterSolanaProvider>
         </MiniAppProvider>
       </WagmiProvider>

src/auth.ts

@@ -1,8 +1,8 @@
-import { AuthOptions, getServerSession } from "next-auth"
+import { AuthOptions, getServerSession } from 'next-auth';
-import CredentialsProvider from "next-auth/providers/credentials";
+import CredentialsProvider from 'next-auth/providers/credentials';
-import { createAppClient, viemConnector } from "@farcaster/auth-client";
+import { createAppClient, viemConnector } from '@farcaster/auth-client';
 
-declare module "next-auth" {
+declare module 'next-auth' {
   interface Session {
     user: {
       fid: number;
@@ -29,40 +29,47 @@ export const authOptions: AuthOptions = {
   // Configure one or more authentication providers
   providers: [
     CredentialsProvider({
-      name: "Sign in with Farcaster",
+      name: 'Sign in with Farcaster',
       credentials: {
         message: {
-          label: "Message",
+          label: 'Message',
-          type: "text",
+          type: 'text',
-          placeholder: "0x0",
+          placeholder: '0x0',
         },
         signature: {
-          label: "Signature",
+          label: 'Signature',
-          type: "text",
+          type: 'text',
-          placeholder: "0x0",
+          placeholder: '0x0',
+        },
+        nonce: {
+          label: 'Nonce',
+          type: 'text',
+          placeholder: 'Custom nonce (optional)',
         },
         // In a production app with a server, these should be fetched from
         // your Farcaster data indexer rather than have them accepted as part
         // of credentials.
         // question: should these natively use the Neynar API?
         name: {
-          label: "Name",
+          label: 'Name',
-          type: "text",
+          type: 'text',
-          placeholder: "0x0",
+          placeholder: '0x0',
         },
         pfp: {
-          label: "Pfp",
+          label: 'Pfp',
-          type: "text",
+          type: 'text',
-          placeholder: "0x0",
+          placeholder: '0x0',
         },
       },
       async authorize(credentials, req) {
         const csrfToken = req?.body?.csrfToken;
-        if (!csrfToken) {
+
-          console.error('CSRF token is missing from request');
+        const nonce = credentials?.nonce || csrfToken;
+
+        if (!nonce) {
+          console.error('No nonce or CSRF token provided');
           return null;
         }
-
         const appClient = createAppClient({
           ethereum: viemConnector(),
         });
@@ -73,8 +80,9 @@ export const authOptions: AuthOptions = {
           message: credentials?.message as string,
           signature: credentials?.signature as `0x${string}`,
           domain,
-          nonce: csrfToken,
+          nonce,
         });
+
         const { success, fid } = verifyResponse;
 
         if (!success) {
@@ -100,30 +108,30 @@ export const authOptions: AuthOptions = {
       name: `next-auth.session-token`,
       options: {
         httpOnly: true,
-        sameSite: "none",
+        sameSite: 'none',
-        path: "/",
+        path: '/',
-        secure: true
+        secure: true,
-      }
+      },
     },
     callbackUrl: {
       name: `next-auth.callback-url`,
       options: {
-        sameSite: "none",
+        sameSite: 'none',
-        path: "/",
+        path: '/',
-        secure: true
+        secure: true,
-      }
+      },
     },
     csrfToken: {
       name: `next-auth.csrf-token`,
       options: {
         httpOnly: true,
-        sameSite: "none",
+        sameSite: 'none',
-        path: "/",
+        path: '/',
-        secure: true
+        secure: true,
-      }
+      },
-    }
+    },
-  }
+  },
-}
+};
 
 export const getSession = async () => {
   try {
@@ -132,4 +140,4 @@ export const getSession = async () => {
     console.error('Error getting server session:', error);
     return null;
   }
-}
+};

src/components/ui/NeynarAuthButton/AuthDialog.tsx

@@ -12,7 +12,7 @@ export function AuthDialog({
 }: {
   open: boolean;
   onClose: () => void;
-  url: string;
+  url?: string;
   isError: boolean;
   error?: Error | null;
   step: 'signin' | 'access' | 'loading';
@@ -47,49 +47,49 @@ export function AuthDialog({
         return {
           title: 'Grant Access',
           description: (
-            <div className='space-y-3'>
+            <div className="space-y-3">
-              <p className='text-gray-600 dark:text-gray-400'>
+              <p className="text-gray-600 dark:text-gray-400">
                 Allow this app to access your Farcaster account:
               </p>
-              <div className='space-y-2 text-sm'>
+              <div className="space-y-2 text-sm">
-                <div className='flex items-center gap-3 p-3 bg-gray-50 dark:bg-gray-700 rounded-lg'>
+                <div className="flex items-center gap-3 p-3 bg-gray-50 dark:bg-gray-700 rounded-lg">
-                  <div className='w-6 h-6 bg-green-100 dark:bg-green-900 rounded-full flex items-center justify-center'>
+                  <div className="w-6 h-6 bg-green-100 dark:bg-green-900 rounded-full flex items-center justify-center">
                     <svg
-                      className='w-3 h-3 text-green-600 dark:text-green-400'
+                      className="w-3 h-3 text-green-600 dark:text-green-400"
-                      fill='currentColor'
+                      fill="currentColor"
-                      viewBox='0 0 20 20'
+                      viewBox="0 0 20 20"
                     >
                       <path
-                        fillRule='evenodd'
+                        fillRule="evenodd"
-                        d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'
+                        d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z"
-                        clipRule='evenodd'
+                        clipRule="evenodd"
                       />
                     </svg>
                   </div>
                   <div>
-                    <div className='font-medium text-gray-900 dark:text-gray-100'>
+                    <div className="font-medium text-gray-900 dark:text-gray-100">
                       Read Access
                     </div>
-                    <div className='text-gray-500 dark:text-gray-400'>
+                    <div className="text-gray-500 dark:text-gray-400">
                       View your profile and public information
                     </div>
                   </div>
                 </div>
-                <div className='flex items-center gap-3 p-3 bg-gray-50 dark:bg-gray-700 rounded-lg'>
+                <div className="flex items-center gap-3 p-3 bg-gray-50 dark:bg-gray-700 rounded-lg">
-                  <div className='w-6 h-6 bg-blue-100 dark:bg-blue-900 rounded-full flex items-center justify-center'>
+                  <div className="w-6 h-6 bg-blue-100 dark:bg-blue-900 rounded-full flex items-center justify-center">
                     <svg
-                      className='w-3 h-3 text-blue-600 dark:text-blue-400'
+                      className="w-3 h-3 text-blue-600 dark:text-blue-400"
-                      fill='currentColor'
+                      fill="currentColor"
-                      viewBox='0 0 20 20'
+                      viewBox="0 0 20 20"
                     >
-                      <path d='M13.586 3.586a2 2 0 112.828 2.828l-.793.793-2.828-2.828.793-.793zM11.379 5.793L3 14.172V17h2.828l8.38-8.379-2.83-2.828z' />
+                      <path d="M13.586 3.586a2 2 0 112.828 2.828l-.793.793-2.828-2.828.793-.793zM11.379 5.793L3 14.172V17h2.828l8.38-8.379-2.83-2.828z" />
                     </svg>
                   </div>
                   <div>
-                    <div className='font-medium text-gray-900 dark:text-gray-100'>
+                    <div className="font-medium text-gray-900 dark:text-gray-100">
                       Write Access
                     </div>
-                    <div className='text-gray-500 dark:text-gray-400'>
+                    <div className="text-gray-500 dark:text-gray-400">
                       Post casts, likes, and update your profile
                     </div>
                   </div>
@@ -118,43 +118,43 @@ export function AuthDialog({
   const content = getStepContent();
 
   return (
-    <div className='fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm'>
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm">
-      <div className='bg-white dark:bg-gray-800 rounded-xl p-6 max-w-md mx-4 shadow-2xl border border-gray-200 dark:border-gray-700'>
+      <div className="bg-white dark:bg-gray-800 rounded-xl p-6 max-w-md mx-4 shadow-2xl border border-gray-200 dark:border-gray-700">
-        <div className='flex justify-between items-center mb-4'>
+        <div className="flex justify-between items-center mb-4">
-          <h2 className='text-lg font-semibold text-gray-900 dark:text-gray-100'>
+          <h2 className="text-lg font-semibold text-gray-900 dark:text-gray-100">
             {isError ? 'Error' : content.title}
           </h2>
           <button
             onClick={onClose}
-            className='text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 transition-colors'
+            className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 transition-colors"
           >
             <svg
-              className='w-6 h-6'
+              className="w-6 h-6"
-              fill='none'
+              fill="none"
-              stroke='currentColor'
+              stroke="currentColor"
-              viewBox='0 0 24 24'
+              viewBox="0 0 24 24"
             >
               <path
-                strokeLinecap='round'
+                strokeLinecap="round"
-                strokeLinejoin='round'
+                strokeLinejoin="round"
                 strokeWidth={2}
-                d='M6 18L18 6M6 6l12 12'
+                d="M6 18L18 6M6 6l12 12"
               />
             </svg>
           </button>
         </div>
 
         {isError ? (
-          <div className='text-center'>
+          <div className="text-center">
-            <div className='text-red-600 dark:text-red-400 mb-4'>
+            <div className="text-red-600 dark:text-red-400 mb-4">
               {error?.message || 'Unknown error, please try again.'}
             </div>
           </div>
         ) : (
-          <div className='text-center'>
+          <div className="text-center">
-            <div className='mb-6'>
+            <div className="mb-6">
               {typeof content.description === 'string' ? (
-                <p className='text-gray-600 dark:text-gray-400'>
+                <p className="text-gray-600 dark:text-gray-400">
                   {content.description}
                 </p>
               ) : (
@@ -162,23 +162,23 @@ export function AuthDialog({
               )}
             </div>
 
-            <div className='mb-6 flex justify-center'>
+            <div className="mb-6 flex justify-center">
               {content.showQR && content.qrUrl ? (
-                <div className='p-4 bg-white rounded-lg'>
+                <div className="p-4 bg-white rounded-lg">
                   {/* eslint-disable-next-line @next/next/no-img-element */}
                   <img
                     src={`https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=${encodeURIComponent(
                       content.qrUrl
                     )}`}
-                    alt='QR Code'
+                    alt="QR Code"
-                    className='w-48 h-48'
+                    className="w-48 h-48"
                   />
                 </div>
               ) : step === 'loading' || isLoading ? (
-                <div className='w-48 h-48 flex items-center justify-center bg-gray-50 dark:bg-gray-700 rounded-lg'>
+                <div className="w-48 h-48 flex items-center justify-center bg-gray-50 dark:bg-gray-700 rounded-lg">
-                  <div className='flex flex-col items-center gap-3'>
+                  <div className="flex flex-col items-center gap-3">
-                    <div className='spinner w-8 h-8' />
+                    <div className="spinner w-8 h-8" />
-                    <span className='text-sm text-gray-500 dark:text-gray-400'>
+                    <span className="text-sm text-gray-500 dark:text-gray-400">
                       {step === 'loading'
                         ? 'Setting up access...'
                         : 'Loading...'}
@@ -204,7 +204,7 @@ export function AuthDialog({
                     '_blank'
                   )
                 }
-                className='btn btn-outline flex items-center justify-center gap-2 w-full'
+                className="btn btn-outline flex items-center justify-center gap-2 w-full"
               >
                 I&apos;m using my phone →
               </button>

src/components/ui/NeynarAuthButton/ProfileButton.tsx

@@ -20,7 +20,7 @@ export function ProfileButton({
   const pfpUrl = userData?.pfpUrl ?? 'https://farcaster.xyz/avatar.png';
 
   return (
-    <div className='relative' ref={ref}>
+    <div className="relative" ref={ref}>
       <button
         onClick={() => setShowDropdown(!showDropdown)}
         className={cn(
@@ -33,14 +33,14 @@ export function ProfileButton({
         {/* eslint-disable-next-line @next/next/no-img-element */}
         <img
           src={pfpUrl}
-          alt='Profile'
+          alt="Profile"
-          className='w-6 h-6 rounded-full object-cover flex-shrink-0'
+          className="w-6 h-6 rounded-full object-cover flex-shrink-0"
           onError={(e) => {
             (e.target as HTMLImageElement).src =
               'https://farcaster.xyz/avatar.png';
           }}
         />
-        <span className='text-sm font-medium truncate max-w-[120px]'>
+        <span className="text-sm font-medium truncate max-w-[120px]">
           {name ? name : '...'}
         </span>
         <svg
@@ -48,39 +48,39 @@ export function ProfileButton({
             'w-4 h-4 transition-transform flex-shrink-0',
             showDropdown && 'rotate-180'
           )}
-          fill='none'
+          fill="none"
-          stroke='currentColor'
+          stroke="currentColor"
-          viewBox='0 0 24 24'
+          viewBox="0 0 24 24"
         >
           <path
-            strokeLinecap='round'
+            strokeLinecap="round"
-            strokeLinejoin='round'
+            strokeLinejoin="round"
             strokeWidth={2}
-            d='M19 9l-7 7-7-7'
+            d="M19 9l-7 7-7-7"
           />
         </svg>
       </button>
 
       {showDropdown && (
-        <div className='absolute top-full right-0 left-0 mt-1 w-48 bg-white dark:bg-gray-800 rounded-lg shadow-lg border border-gray-200 dark:border-gray-700 z-50'>
+        <div className="absolute top-full right-0 left-0 mt-1 w-48 bg-white dark:bg-gray-800 rounded-lg shadow-lg border border-gray-200 dark:border-gray-700 z-50">
           <button
             onClick={() => {
               onSignOut();
               setShowDropdown(false);
             }}
-            className='w-full px-4 py-3 text-left text-sm text-gray-700 dark:text-gray-300 hover:bg-gray-50 dark:hover:bg-gray-700 flex items-center gap-3 rounded-lg transition-colors'
+            className="w-full px-4 py-3 text-left text-sm text-gray-700 dark:text-gray-300 hover:bg-gray-50 dark:hover:bg-gray-700 flex items-center gap-3 rounded-lg transition-colors"
           >
             <svg
-              className='w-4 h-4'
+              className="w-4 h-4"
-              fill='none'
+              fill="none"
-              stroke='currentColor'
+              stroke="currentColor"
-              viewBox='0 0 24 24'
+              viewBox="0 0 24 24"
             >
               <path
-                strokeLinecap='round'
+                strokeLinecap="round"
-                strokeLinejoin='round'
+                strokeLinejoin="round"
                 strokeWidth={1.5}
-                d='M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1'
+                d="M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1"
               />
             </svg>
             Sign out

src/components/ui/NeynarAuthButton/index.tsx

@@ -10,25 +10,78 @@ import { ProfileButton } from '~/components/ui/NeynarAuthButton/ProfileButton';
 import { AuthDialog } from '~/components/ui/NeynarAuthButton/AuthDialog';
 import { getItem, removeItem, setItem } from '~/lib/localStorage';
 import { useMiniApp } from '@neynar/react';
+import {
+  signIn as backendSignIn,
+  signOut as backendSignOut,
+} from 'next-auth/react';
+import sdk, { SignIn as SignInCore } from '@farcaster/frame-sdk';
 
 const STORAGE_KEY = 'neynar_authenticated_user';
 const FARCASTER_FID = 9152;
 
 interface StoredAuthState {
   isAuthenticated: boolean;
-  userData?: {
+  user: {
-    fid?: number;
+    object: 'user';
-    pfpUrl?: string;
+    fid: number;
-    username?: string;
+    username: string;
+    display_name: string;
+    pfp_url: string;
+    custody_address: string;
+    profile: {
+      bio: {
+        text: string;
+        mentioned_profiles?: Array<{
+          object: 'user_dehydrated';
+          fid: number;
+          username: string;
+          display_name: string;
+          pfp_url: string;
+          custody_address: string;
+        }>;
+        mentioned_profiles_ranges?: Array<{
+          start: number;
+          end: number;
+        }>;
       };
-  lastSignInTime?: number;
+      location?: {
-  signers?: {
+        latitude: number;
+        longitude: number;
+        address: {
+          city: string;
+          state: string;
+          country: string;
+          country_code: string;
+        };
+      };
+    };
+    follower_count: number;
+    following_count: number;
+    verifications: string[];
+    verified_addresses: {
+      eth_addresses: string[];
+      sol_addresses: string[];
+      primary: {
+        eth_address: string;
+        sol_address: string;
+      };
+    };
+    verified_accounts: Array<Record<string, unknown>>;
+    power_badge: boolean;
+    url?: string;
+    experimental?: {
+      neynar_user_score: number;
+      deprecation_notice: string;
+    };
+    score: number;
+  } | null;
+  signers: {
     object: 'signer';
     signer_uuid: string;
     public_key: string;
     status: 'approved';
     fid: number;
-  }[]; // Store the list of signers
+  }[];
 }
 
 // Main Custom SignInButton Component
@@ -48,6 +101,12 @@ export function NeynarAuthButton() {
   const [pollingInterval, setPollingInterval] = useState<NodeJS.Timeout | null>(
     null
   );
+  const [message, setMessage] = useState<string | null>(null);
+  const [signature, setSignature] = useState<string | null>(null);
+  const [debugState, setDebugState] = useState<string | null>(null);
+
+  // Determine which flow to use based on context
+  const useBackendFlow = context !== undefined;
 
   // Helper function to create a signer
   const createSigner = useCallback(async () => {
@@ -68,6 +127,24 @@ export function NeynarAuthButton() {
     }
   }, []);
 
+  // Helper function to fetch user data from Neynar API
+  const fetchUserData = useCallback(
+    async (fid: number): Promise<User | null> => {
+      try {
+        const response = await fetch(`/api/users?fids=${fid}`);
+        if (response.ok) {
+          const data = await response.json();
+          return data.users?.[0] || null;
+        }
+        return null;
+      } catch (error) {
+        console.error('Error fetching user data:', error);
+        return null;
+      }
+    },
+    []
+  );
+
   // Helper function to generate signed key request
   const generateSignedKeyRequest = useCallback(
     async (signerUuid: string, publicKey: string) => {
@@ -123,13 +200,19 @@ export function NeynarAuthButton() {
         const signerData = await response.json();
 
         if (response.ok) {
+          let user: StoredAuthState['user'] | null = null;
+
+          if (signerData.signers && signerData.signers.length > 0) {
+            user = await fetchUserData(signerData.signers[0].fid);
+          }
+
           // Store signers in localStorage, preserving existing auth data
           const existingAuth = getItem<StoredAuthState>(STORAGE_KEY);
           const updatedState: StoredAuthState = {
             ...existingAuth,
-            isAuthenticated: true,
+            isAuthenticated: !!user,
             signers: signerData.signers || [],
-            lastSignInTime: existingAuth?.lastSignInTime || Date.now(),
+            user,
           };
           setItem<StoredAuthState>(STORAGE_KEY, updatedState);
           setStoredAuth(updatedState);
@@ -225,8 +308,7 @@ export function NeynarAuthButton() {
     const existingAuth = getItem<StoredAuthState>(STORAGE_KEY);
     const authState: StoredAuthState = {
       isAuthenticated: true,
-      userData: res as StoredAuthState['userData'],
+      user: res as StoredAuthState['user'],
-      lastSignInTime: Date.now(),
       signers: existingAuth?.signers || [], // Preserve existing signers
     };
     setItem<StoredAuthState>(STORAGE_KEY, authState);
@@ -246,8 +328,8 @@ export function NeynarAuthButton() {
   });
 
   const {
-    signIn,
+    signIn: frontendSignIn,
-    signOut,
+    signOut: frontendSignOut,
     connect,
     reconnect,
     isSuccess,
@@ -259,63 +341,97 @@ export function NeynarAuthButton() {
     validSignature,
   } = signInState;
 
-  // Connect when component mounts and we have a nonce
   useEffect(() => {
-    if (nonce && !channelToken) {
+    setMessage(data?.message || null);
+    setSignature(data?.signature || null);
+  }, [data?.message, data?.signature]);
+
+  // Connect for frontend flow when nonce is available
+  useEffect(() => {
+    if (!useBackendFlow && nonce && !channelToken) {
       connect();
     }
-  }, [nonce, channelToken, connect]);
+  }, [useBackendFlow, nonce, channelToken, connect]);
 
   // Handle fetching signers after successful authentication
   useEffect(() => {
-    if (data?.message && data?.signature) {
+    if (message && signature) {
       const handleSignerFlow = async () => {
         try {
-          // Ensure we have message and signature
+          // // Ensure we have message and signature
-          if (!data.message || !data.signature) {
+          // if (!message || !signature) {
-            console.error('❌ Missing message or signature');
+          //   console.error('❌ Missing message or signature');
-            return;
+          //   return;
-          }
+          // }
 
           // Step 1: Change to loading state
           setDialogStep('loading');
           setSignersLoading(true);
 
           // First, fetch existing signers
-          const signers = await fetchAllSigners(data.message, data.signature);
+          const signers = await fetchAllSigners(message, signature);
+
+          setDebugState('Fetched signers...');
 
           // Check if no signers exist or if we have empty signers
           if (!signers || signers.length === 0) {
             // Step 1: Create a signer
             const newSigner = await createSigner();
 
+            setDebugState('Created new signer...');
+
             // Step 2: Generate signed key request
             const signedKeyData = await generateSignedKeyRequest(
               newSigner.signer_uuid,
               newSigner.public_key
             );
 
+            setDebugState('Generated signed key request...');
+
             // Step 3: Show QR code in access dialog for signer approval
             if (signedKeyData.signer_approval_url) {
+              setDebugState('Setting signer approval URL...');
               setSignerApprovalUrl(signedKeyData.signer_approval_url);
               setSignersLoading(false); // Stop loading, show QR code
-              if (isMobile() && context?.client?.clientFid === FARCASTER_FID) {
+              if (
+                context?.client?.platformType === 'mobile' &&
+                context?.client?.clientFid === FARCASTER_FID
+              ) {
+                setDebugState('Opening mobile app...');
                 setShowDialog(false);
-                window.open(signedKeyData.signer_approval_url, '_blank');
+                await sdk.actions.openUrl(
+                  signedKeyData.signer_approval_url.replace(
+                    'https://client.farcaster.xyz/deeplinks/',
+                    'farcaster://'
+                  )
+                );
               } else {
-                setDialogStep('access'); // Switch to access step to show QR
+                setDebugState(
+                  'Opening access dialog...' +
+                    ` ${context?.client?.platformType}` +
+                    ` ${context?.client?.clientFid}`
+                );
+                setDialogStep('access');
+                setShowDialog(true);
+                setDebugState(
+                  'Opening access dialog...2' +
+                    ` ${dialogStep}` +
+                    ` ${showDialog}`
+                );
               }
 
               // Step 4: Start polling for signer approval
-              startPolling(newSigner.signer_uuid, data.message, data.signature);
+              startPolling(newSigner.signer_uuid, message, signature);
             }
           } else {
+            setDebugState('Signers already exist, proceeding to signin...');
             // If signers exist, close the dialog
             setSignersLoading(false);
             setShowDialog(false);
             setDialogStep('signin');
           }
         } catch (error) {
+          setDebugState('Error in signer flow:');
           console.error('❌ Error in signer flow:', error);
           // On error, reset to signin step
           setDialogStep('signin');
@@ -326,48 +442,111 @@ export function NeynarAuthButton() {
       handleSignerFlow();
     }
   }, [
-    data?.message,
+    message,
-    data?.signature,
+    signature,
     fetchAllSigners,
     createSigner,
     generateSignedKeyRequest,
     startPolling,
   ]);
 
-  const handleSignIn = useCallback(() => {
+  // Backend flow using NextAuth
+  const handleBackendSignIn = useCallback(async () => {
+    if (!nonce) {
+      console.error('❌ No nonce available for backend sign-in');
+      return;
+    }
+
+    try {
+      setSignersLoading(true);
+      const result = await sdk.actions.signIn({ nonce });
+
+      const signInData = {
+        message: result.message,
+        signature: result.signature,
+        redirect: false,
+        nonce: nonce,
+      };
+
+      const nextAuthResult = await backendSignIn('credentials', signInData);
+      if (nextAuthResult?.ok) {
+        setMessage(result.message);
+        setSignature(result.signature);
+      } else {
+        console.error('❌ NextAuth sign-in failed:', nextAuthResult);
+      }
+    } catch (e) {
+      if (e instanceof SignInCore.RejectedByUser) {
+        console.log('ℹ️ Sign-in rejected by user');
+      } else {
+        console.error('❌ Backend sign-in error:', e);
+      }
+    }
+  }, [nonce]);
+
+  const handleFrontEndSignIn = useCallback(() => {
     if (isError) {
       reconnect();
     }
     setDialogStep('signin');
     setShowDialog(true);
-    signIn();
+    frontendSignIn();
 
     // Open mobile app if on mobile and URL is available
     if (url && isMobile()) {
       window.open(url, '_blank');
     }
-  }, [isError, reconnect, signIn, url]);
+  }, [isError, reconnect, frontendSignIn, url]);
+
+  const handleSignOut = useCallback(async () => {
+    try {
+      setSignersLoading(true);
+
+      if (useBackendFlow) {
+        await backendSignOut({ redirect: false });
+      } else {
+        frontendSignOut();
+      }
 
-  const handleSignOut = useCallback(() => {
-    setShowDialog(false);
-    signOut();
       removeItem(STORAGE_KEY);
       setStoredAuth(null);
-  }, [signOut]);
+      setShowDialog(false);
+      setDialogStep('signin');
+      setSignerApprovalUrl(null);
+      setMessage(null);
+      setSignature(null);
+      setDebugState(null);
+
+      // Reset polling interval
+      if (pollingInterval) {
+        clearInterval(pollingInterval);
+        setPollingInterval(null);
+      }
+    } catch (error) {
+      console.error('❌ Error during sign out:', error);
+      // Optionally handle error state
+    } finally {
+      setSignersLoading(false);
+    }
+  }, [useBackendFlow, frontendSignOut, pollingInterval]);
 
   // The key fix: match the original library's authentication logic exactly
   const authenticated =
     ((isSuccess && validSignature) || storedAuth?.isAuthenticated) &&
     !!(storedAuth?.signers && storedAuth.signers.length > 0);
-  const userData = data || storedAuth?.userData;
+  const userData = {
+    fid: storedAuth?.user?.fid,
+    username: storedAuth?.user?.username || '',
+    pfpUrl: storedAuth?.user?.pfp_url || '',
+  };
 
   // Show loading state while nonce is being fetched or signers are loading
   if (!nonce || signersLoading) {
     return (
-      <div className='flex items-center justify-center'>
+      <div className="flex items-center justify-center">
-        <div className='flex items-center gap-3 px-4 py-2 bg-gray-100 dark:bg-gray-800 rounded-lg'>
+        <div className="flex items-center gap-3 px-4 py-2 bg-gray-100 dark:bg-gray-800 rounded-lg">
-          <div className='spinner w-4 h-4' />
+          <div className="spinner w-4 h-4" />
-          <span className='text-sm text-gray-600 dark:text-gray-400'>
+          <span className="text-sm text-gray-600 dark:text-gray-400">
             Loading...
           </span>
         </div>
@@ -381,32 +560,32 @@ export function NeynarAuthButton() {
         <ProfileButton userData={userData} onSignOut={handleSignOut} />
       ) : (
         <Button
-          onClick={handleSignIn}
+          onClick={useBackendFlow ? handleBackendSignIn : handleFrontEndSignIn}
-          disabled={!url}
+          disabled={!useBackendFlow && !url}
           className={cn(
             'btn btn-primary flex items-center gap-3',
             'disabled:opacity-50 disabled:cursor-not-allowed',
             'transform transition-all duration-200 active:scale-[0.98]',
-            !url && 'cursor-not-allowed'
+            !url && !useBackendFlow && 'cursor-not-allowed'
           )}
         >
-          {!url ? (
+          {!useBackendFlow && !url ? (
             <>
-              <div className='spinner-primary w-5 h-5' />
+              <div className="spinner-primary w-5 h-5" />
               <span>Initializing...</span>
             </>
           ) : (
             <>
-              <span>Sign in with Neynar</span>
+              <span>{debugState || 'Sign in with Neynar'}</span>
             </>
           )}
         </Button>
       )}
 
       {/* Unified Auth Dialog */}
-      {url && (
+      {
         <AuthDialog
-          open={showDialog && !isMobile()}
+          open={showDialog}
           onClose={() => {
             setShowDialog(false);
             setDialogStep('signin');
@@ -423,7 +602,7 @@ export function NeynarAuthButton() {
           isLoading={signersLoading}
           signerApprovalUrl={signerApprovalUrl}
         />
-      )}
+      }
     </>
   );
 }