Each newsroom on Pressbase has its own individual subscription. It's not a Pressbase subscription for all newsroom.
To change the card for the subscription for a newsroom, please sign in to pressbase.io > visit Newsrooms tab > find the newsroom you wan to manage.
Click the Manage billing button in the Subscription row.
A billing portal page hosted by our payment provider Stripe will be opened.
Click Add payment method:
Enter your new card information and then click the Add button. Check Use as default payment method if you want to use the payment method for all future charges.
Your new card will then be added to your subscription.