Log in to https://app.wipperoz.com/en
Go to "Account settings" using the menu in the upper right corner that shows your first and last name or your profile image if you are using the platform from a mobile device.
Go to the "Subscription" tab
On the left, you will see a box with the name of the plan and its features.
On the right, you will be able to check if you have a payment method entered and its details.