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Use custom() to send structured, platform-specific payloads. Reach for this when the receiving provider supports rich content types that don’t fit into the built-in builders. 
import { custom } from "spectrum-ts";

await space.send(custom({ type: "card", title: "Order Confirmed" }));
The raw payload round-trips through the provider’s send action. The provider decides how to interpret it. If you need a reusable provider-specific abstraction, wrap custom() in your own helper so call sites still read like product-level actions.