Keto Plan 28's transactions are done through PayPal. You can pay with your PayPal account, or with a credit card. Credit card purchases are also processed through PayPal. You will recieve an email from PayPal upon payment confirming your payment.
The credit card transaction will appear on your statement as PAYPAL *KP28.
If you're interested in requesting a refund, you can only do that through PayPal.