Withdrawalcompleted
Derived alias of withdrawal.updated filtered to status === "completed". Subscribe to this event if you only
want a notification when a withdrawal terminally succeeds (funds have left SideShift and have been sent to the
user’s external payout method).
For the full lifecycle (in-transit, failed, canceled, denied transitions), subscribe to withdrawal.updated
instead. The two events fire together when a withdrawal transitions into completed.
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