Yes, very safe! fitli.com uses Braintree, a part of PayPal.com to process credit card transactions. Braintree keeps your credit card numbers in a secure digital vault, and not even employees at fitli or your businesses can access your personal credit card numbers. For security purposes, we can only see the last several numbers of your card, we don't have access! And, when entering your card, you're using industry standard SSL certifications over a secure link to our processor.
Here is a link to Braintree where you can read more about their security processes: