Where should I keep the Sendsar API key?

Keep sk_* on your server only. Never put it in a browser or mobile app. Clients call your authenticated BFF session route instead.

Why does createRoom fail for a peer user?

JWT createRoom cannot invent users. The peer must have logged in once (minted), or you upsert them with sk_* on your server.

Enable Calls for the workspace in the Sendsar dashboard. Chat still works when Calls is off.

Ship chat with a thin backend: pick UI Kit or SDK, mint a session JWT, connect, then create rooms when your product needs a conversation.

Pick UI Kit or SDK first — the remaining steps follow that path.

Drop-in chat UI — rooms, composer, and presence without building them yourself.

Installpnpm add @sendsar/chat-uikit-angular @sendsar/chat-sdk-javascript @sendsar/call-sdk-javascript @sendsar/protocol