Payout.closed_at reflects the time at which the payout was closed
and after which it no longer accepts new transactions.
We estimate this date per vendor and therefore it may not be accurate, but is an upper bound.
Paid, whichever comes earlier.
Shopifythis is determined by the
issued_atdate for payouts received as
The format of this field will align with all other date fields (type
string, RFC 3339 format.)