This specific error usually means your account or payment method has been flagged for a manual review by GitHub's billing security system. It's not necessarily an issue with your bank, but rather a safety check on GitHub's side.

Why is this happening?

Information Mismatch: The billing address or name doesn't perfectly match your card details.

VPN/Proxy: If you were using a VPN during the checkout, it might have triggered a fraud alert.

Regional Restrictions: Sometimes there are temporary validation issues with cards from specific regions.

What should you do now?

Wait the 48 hours: As the message says, their team is likely reviewing the block. Trying to force the payment multiple times now might actually extend the flag on your account.

Verify your Profile: Ensure your GitHub Billing Profile has your full legal name and an address that matches your credit card statement.

Check your Email: Look for an email from GitHub Support or 'GitHub Billing'—they might have sent a request for more information or a notification that the review is complete.

Contact Support Directly: If 48 hours pass and you haven't heard back, open a ticket at GitHub Support (https://support.github.com/contact/billing&authuser=1). This is a billing-specific issue that only a GitHub employee can manually override.