Via App Store (iOS)
Go to Settings on your iPhone > tap your name > Payment & Shipping > edit your payment method.
Via Google Play (Android)
Open Google Play > tap your profile icon > Payments & Subscriptions > Payment Methods > update your card.
Via the Playbook web portal
Log in at my.playbookapp.io, go to the Subscription section, and update your billing details there.
Still need help? Email us at support@playbookapp.io