Type Alias CheckoutState

CheckoutState: "idle" | "mounting" | "ready" | "destroyed"

Current lifecycle state of a CheckoutController.

idle: created but not mounted, cleanly unmounted, or returned after a failed mount; CheckoutController.mount may be called.
mounting: the iframe exists and is negotiating readiness.
ready: Checkout is interactive and CheckoutController.mount has resolved.
destroyed: terminal state; create a new controller to show Checkout again.