phorge-phorge/src/applications/differential/storage/DifferentialTransaction.php

<?php

final class DifferentialTransaction extends PhabricatorApplicationTransaction {

  public function getApplicationName() {
    return 'differential';
  }

  public function getApplicationTransactionType() {
    return DifferentialPHIDTypeRevision::TYPECONST;
  }

  public function getApplicationTransactionCommentObject() {
    return new DifferentialTransactionComment();
  }

}