Fix Claude 3D Secure Payment Failed Error

When subscribing to Claude Pro or purchasing Anthropic API credits, you may encounter payment failures related to 3D Secure (3DS) or Strong Customer Authentication (SCA). This security protocol, mandated by many banks (especially in the European Economic Area, UK, and India), requires a secondary verification step—such as a one-time passcode sent via SMS or a confirmation prompt inside your banking app.

Because Anthropic uses Stripe to process transactions, any interruption in the communication between Stripe, your browser, and your bank will cause the transaction to fail immediately. Here is how to troubleshoot and resolve 3D Secure payment failures on Claude.

1. Disable Pop-Up and Redirect Blockers The most common reason for 3DS failures is that your browser or an extension blocked the verification modal. When Stripe initiates the 3DS check, it attempts to open a pop-up window or redirect you to your bank's secure page.

• In Chrome: Look at the right side of your address bar. If you see a small icon with a red "x" over a window, click it and select "Always allow pop-ups and redirects from claude.ai and anthropic.com."
• In Safari: Go to Settings > Websites > Pop-up Windows and change the permission for both domains to "Allow."
• In Brave: Click the Brave Shield icon in the address bar and toggle shields "Off" temporarily for the billing page to allow external bank scripts to run.

2. Temporarily Disable Privacy and Ad-Blocking Extensions Many privacy-focused browser extensions block the third-party tracking scripts that banks use to analyze transaction security during a 3DS handshake.

1. Temporarily disable extensions like uBlock Origin, Privacy Badger, Ghostery, or NoScript.
2. Reload the Claude billing page.
3. Re-enter your card details and attempt the payment again.
4. Once the payment is processed, you can safely re-enable your extensions.

3. Switch to a Mobile Device or Alternate Browser If your desktop browser's configuration remains stubborn, switching to a clean mobile browser environment often bypasses local script conflicts.

1. Open Safari on iOS or Chrome on Android.
2. Log in to your Claude account and navigate to the billing page.
3. Complete the payment flow. Mobile browsers are highly optimized for banking app redirects, meaning your phone will likely auto-launch your banking app to authorize the transaction seamlessly.

4. Verify Bank App Push Notifications and MFA Enrollment Sometimes the transaction hangs because your bank is waiting for you to approve the charge within their mobile banking application, but you have notifications disabled.

1. Unlock your phone and open your bank's official app.
2. Check the "Notifications" or "Pending Authorizations" section.
3. Ensure your card is enrolled in your bank's version of 3DS (e.g., Visa Secure, Mastercard Identity Check, or Amex SafeKey). If your card is not registered for Multi-Factor Authentication (MFA), your bank may automatically decline international transactions from US-based merchants like Anthropic.

5. Use an Alternative Payment Method If your physical card continues to reject the 3DS handshake, you can use digital wallets or virtual cards which bypass traditional 3DS checks by utilizing device-level biometric authentication.

• Apple Pay / Google Pay: If these options are visible on your checkout page, use them. They authorize payments via on-device biometrics (FaceID/TouchID), which automatically satisfies SCA requirements.
• Virtual Cards: Services like Privacy.com, Revolut, or Wise issue virtual cards that have customizable 3DS profiles and are less likely to trigger fraud alerts on automated billing platforms.

When to Escalate If you have completed all the steps above and your bank confirms that they are not seeing any incoming authorization requests, the issue may lie with your billing profile blocklist status on Stripe.

Contact the billing support team through the official support widget on the Claude platform. Provide them with the last 4 digits of your card, the exact timestamp of your failed attempt, and any specific error code shown on the screen. Do not share your full card number or CVV in any support messages.