Fix Claude.ai Subscription Payment -- 2

My Claude.ai Max renewal refuses to go through: the site stalls at the “processing” step every time I try to pay with my verified credit-debit card, even though the card works elsewhere and both the number and available balance check out.

I need someone who knows the typical payment gateways Claude (Anthropic) uses, can isolate why the transaction never completes, and then walk me through—or carry out—whatever fixes are required so the subscription is successfully charged and activated. This may involve identifying browser or cache conflicts, tracing PCI-compliance errors in the checkout flow, or liaising with their billing support to clear a flag on the account.

Deliverable
• A step-by-step resolution that ends with the subscription showing as paid and active, plus notes on any settings or gateway configurations changed so I can replicate the fix next cycle.