Types of RBM features that the user supports

FEATURE_UNSPECIFIED Should not be used
REVOCATION Revocation. If revocation is supported, the agent can revoke a message after it has been sent but before it has been delivered.
RICHCARD_STANDALONE Standalone rich cards
ACTION_CREATE_CALENDAR_EVENT Suggested action to create a calendar event
ACTION_DIAL Suggested action to dial a number
ACTION_OPEN_URL Suggested action to open a URL
ACTION_SHARE_LOCATION Suggested action to share a location
ACTION_VIEW_LOCATION Suggested action to view a location in a map app