Secure websites usually indicate this by displaying a small padlock icon to the left of the address bar.

1. Check for the padlock icon: Secure websites usually indicate this by displaying a small padlock icon to the left of the address bar.
2. Check the URL: Secure websites often begin with 'https' (as opposed to 'http') as part of the URL.
3. Look into the checkout process: The checkout process should take place on a secure page with 'https' in the URL.
4. Leave the site if required: Some online payment services have their own secure payment page, and require you to leave the merchant's website.
5. Look for security certificates: Some websites display security certifications or other trust logos.