First, join your class with the 5-digit Class Code provided by your instructor; if you do not already have Flipd Premium, Flipd will then prompt you to make a payment of $3.99 USD. You can make your purchase directly through your mobile device (App Store or Google Play), which requires a credit card or gift card linked to the account. Learn more about mobile payments through your app store support. 

The in-app purchase covers your full access to Flipd across multiple classes and will also give you access to a suite of productivity features you can use at home! If you have trouble with payment, please refer here.