Content Card Types for Web
Requesting Unviewed Content Card Count for Web
You can request the number of unread cards at any time by calling:
This is often used to power badges signifying how many unread content cards there are. See the JSDocs for more information.
ab.Card objects may optionally carry key-value pairs as
extras. These can be used to send data down along with a card for further handling by the application. Call
card.extras to access these values.