You can block transactions made by cards from certain locations by creating a custom block rule in Stripe Radar. The below rule will only block card charges from cards issued in the specified countries.

From the Rules section of your Radar Dashboard:

1. Scroll down to the Block rules section.

2. Click + Add rule.

3. Add the following block rule depending on the country you want to block charges from:

US cards:

Block if :card_country: = 'US'

Canadian cards:

Block if :card_country: = 'CA'

4. Click Test rule to ensure that the block rule is functional.

5. Click Add and enable once the block rule test has been completed successfully.

Note that the above rules only block cards based on their card_country attribute, which is represented as the two-letter ISO country code for the country in question. In the above cases, US is for the United States and CA is for Canada.