Read + validate the donationTrainApiUrl config field. Throws with
a diagnostic message when it's unset, matching the pattern used by
import("../playlive").fetchLifetimeRaised's guard.
Returns string
The configured donation-train service base URL.
Throws
Error when donationTrainApiUrl isn't set on the config.
Read + validate the
donationTrainApiUrlconfig field. Throws with a diagnostic message when it's unset, matching the pattern used by import("../playlive").fetchLifetimeRaised's guard.