At the end of the free 30-day trial, all features of your Matter channel and web app will be locked. For example, team members will not be able to give or receive kudos and Feedback Friday will not occur.
In order to continue using Matter, a workspace Owner/Admin will need to add a payment method.
How to Add a Payment Method
Open the Web App.
Go to Channel Settings > Billing tab.
Select the monthly or annual plan.
Enter in card information and hit Submit Payment.