Resolve Claude Subscription Payment Issue

I’m ready to upgrade my Anthropic Claude account so I can rely on its Pro or Max features for research and everyday questions, but my payment card keeps getting declined during checkout. I already have an account and simply need to complete the subscription—no additional seats or team setup required.

Here’s what I need from you:
• Diagnose why the card is being rejected (e.g., billing address mismatch, card-type restrictions, bank blocks).
• Walk me through real-time troubleshooting steps—screen-share or clear written instructions are both fine.
• Recommend practical work-arounds if the card cannot be used (alternate payment methods, updated browser or VPN settings, etc.).
• Confirm successful activation so I can immediately access either Claude Pro or Claude Max features.

Clear communication and proven experience resolving SaaS payment or access issues are essential. I’m hoping for a quick turnaround so I can start using Claude without further delays.