You'll need to update your payment information on the same platform you subscribed on. Follow the instructions below for each platform (iOS, Android, and Web).
iOS
- Open the Settings app on your iPhone > iTunes & App Store > tap your Apple ID > View Apple ID > tap Payment Information
Android
- If you made the purchase using your Google Play Store account, open the Google Play Store > tap the menu icon > My Account > Add Payment Method or Edit Payment Method
Web (Roomiapp.com)
- Go to roomiapp.com and sign in > tap the profile icon > Settings > Payment Info > Add Credit Card or Edit Credit Card.