Note that this endpoint does not trigger a fetch of account numbers from the institution; it merely returns
account numbers that have already been fetched, either because prefetch was requested when the link was created,
or because of an on-demand update. To force a check for new/updated account numbers, you must use the
If you have requested prefetch or an on-demand update, you should check the refreshed_at date
for this product in the returned response, and compare that against the previous refreshed_at date, which you can
get from any previous response for this or any other account or link request. If the refreshed_at date has not
increased, then updated data is not yet available.