code: public function setNumberHash( $numberHash )
      {
          $numberHash = trim( $numberHash );
  
          if (strlen( $numberHash ) > 40) {
              throw new InvalidArgumentException( sprintf( 'Card number hash should be no longer than 40 characters (%s)',
                  $numberHash ) );
          }
  
          $this->numberHash = $numberHash;
  
          return $this;
      }
docs: @param  string $numberHash
  
  @return $this