You can see your subscription purchase and the end date for the subscription on the My Purchases page here: https://www.pinkcatgames.com/mypurchases
You can also download a receipt for your purchase on the My Account page. Click on your name in top right corner of the website and choose My Account from the dropdown menu.
Then click the View Billing History button to see your subscription purchases. https://www.pinkcatgames.com/myaccount