You can add credit card and billing information while purchasing a new space.
To purchase a new space:
In the top-left of the navigation bar, click the organization name, then click "Organization settings & subscriptions".
Click Create space.
To update billing details for an existing space:
Log into the web app.
In the top navigation bar, click the Billing tab.
Click on Billing address > Edit.
Billing information can only be updated by an organization owner
Billing information cannot be added or updated if your organization is on a legacy plan. You will need to migrate to our current pricing structure. For more information, visit our pricing page.