Updated Side Panels and API Attributes

Public API responses now include custom attributes for sites and clients.

Refreshed design for Conversation, Client, Site, and Project side panels

Legacy site and user IDs supported across Public API reads and writes.

Faster participant lookups in the Public API, with lower database load.

Branded delivery for signup verification, resend-code, and password-reset emails.

Call-for-pricing plans no longer appear as misleading $0 self-serve options in the billing portal.