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Claude's billing page fails to load most often because of browser extensions blocking payment scripts or a stale session. Open the billing page in an incognito window without any extensions — this resolves the issue in most cases. Go to Settings → Billing after signing in. If the page loads in incognito but not your regular browser, the culprit is an ad blocker or privacy extension.
To change your Claude plan, go to Settings → Billing → Change Plan on claude.ai. Upgrading from Free to Pro ($20/month) activates immediately. Downgrading from Pro to Free takes effect at the end of your current billing period — you keep Pro access until then. You will not lose your conversation history when changing plans, but Projects require a Pro subscription to remain active.
Claude invoices appear in Settings → Billing on claude.ai and are also emailed from Anthropic within minutes of a successful payment. If your invoice is not showing, first confirm you are logged into the correct account — the receipt goes to the email used for purchase. Billing history can take up to 24 hours to appear for new subscriptions. If no invoice arrives after 24 hours, contact support.anthropic.com.
Claude Pro costs $20/month and payment declines are almost always caused by your bank blocking the charge, not a problem with Claude itself. Call your bank or approve the transaction in your banking app, then retry in a clean incognito window. If a 3D Secure prompt appeared and timed out, that is the most common single cause — complete the bank verification step and retry.
Claude payment failures fall into four categories: bank block (most common), expired or incorrect card details, billing address mismatch, or a temporary issue with Anthropic's Stripe-powered payment processor. Go to Settings → Billing → Manage Subscription to update your card and retry. If the error says 'card declined,' call your bank first before retrying — multiple failed attempts can trigger a longer fraud block.
Claude Pro costs $20/month and should activate within 5 minutes of a successful payment. If Pro features are still missing, log out and back in to refresh your session token. If the problem persists after 30 minutes, check that the charge posted to your bank (not just pending) and contact support at support.anthropic.com with your receipt.