# Block a specific credit card from being accepted

You can block a specific card number from transactions directly in your Dashboard or using the Stripe API.
## Block a card from the Dashboard
There are two ways to block a card number in the Dashboard:
1. From the [Payments](https://dashboard.stripe.com/payments) section of the Dashboard, select the charge from the customer whose card you want to block, click **Refund** in the top right corner, and select **Fraudulent** as the refund reason. This adds the payment’s card and email to your blocklist.
1. If you have Radar Plus or Radar Pro, navigate to your [Radar blocklist](https://dashboard.stripe.com/radar/lists), where you can view, add, and delete card numbers and email addresses manually.
## Block a card using the Stripe API
You can block a card in the API two ways:
1. Create a [refund request](https://stripe.com/docs/api#create_refund) and include `reason='fraudulent'`.
1. Add charges to your [Radar blocklist](https://dashboard.stripe.com/radar/lists) by making a [charge update request](https://stripe.com/docs/api#update_charge) with `fraud_details.user_report='fraudulent'`.