You can update or remove your credit card in either the Manager Mobile App or the Web App. The system currently supports only one credit card at a time, so you’ll need to delete the existing card before adding a new one.
Manager Mobile App
In the Manager Mobile App, select Profile and then select Payment. If your credit card is about to expired and would like to update it, please remove the old credit card by swiping to left and then add a new credit card. When the credit card is expired or when there is no credit card on file, all of your devices will be switch to the Basic Plan automatically. Find the following steps for reference. 
Web Dashboard App at https://lubn.app/
To update your credit card info in the Dashboard, select “Ledger” and then Account.
Please note that your credit card info is safely stored with Stripe, a third party payment
processing company. Lubn does not keep your credit card info.