/**
  * @param FindSettlementsCriteria $criteria
  *
  * @return array
  */
 private function convertFindSettlementsCriteriaToRequest(FindSettlementsCriteria $criteria)
 {
     $createdAtFrom = $criteria->getCreatedAtFrom();
     $createdAtTo = $criteria->getCreatedAtTo();
     $updatedAtFrom = $criteria->getUpdatedAtFrom();
     $updatedAtTo = $criteria->getUpdatedAtTo();
     $releasedAtFrom = $criteria->getReleasedAtFrom();
     $releasedAtTo = $criteria->getReleasedAtTo();
     return ['created_at_from' => null === $createdAtFrom ? null : $createdAtFrom->format(DateTime::ISO8601), 'created_at_to' => null === $createdAtTo ? null : $createdAtTo->format(DateTime::ISO8601), 'updated_at_from' => null === $updatedAtFrom ? null : $updatedAtFrom->format(DateTime::ISO8601), 'updated_at_to' => null === $updatedAtTo ? null : $updatedAtTo->format(DateTime::ISO8601), 'released_at_from' => null === $releasedAtFrom ? null : $releasedAtFrom->format(DateTime::ISO8601), 'released_at_to' => null === $releasedAtTo ? null : $releasedAtTo->format(DateTime::ISO8601)];
 }