Fix Claude AI Payment Failure -- 3

My Claude AI Max upgrade stalls right after I key in my credit-card details; the payment simply never processes and the subscription remains inactive. There are no obvious error codes—just an endless loading state that eventually resets the form.

I’ve already tried different credit and debit cards, cleared cache, switched browsers and devices, yet the result is always the same: payment fails directly after the card information is submitted.

I need a hands-on payment-flow specialist who can:
• Diagnose why the transaction is being blocked at this stage
• Guide me—step by step—through the fix or implement it if account access is required
• Confirm that the subscription activates successfully once the charge is accepted

You’ll likely be dealing with standard card gateways, possible 3-D Secure checks, and whatever billing platform Claude AI uses (Stripe, Paddle, etc.). Clear, concise communication and a verifiable solution are the only acceptance criteria.