public function setTimestamp($timestamp = 0)
    {
        $this->timestamp = $timestamp;
        if ($timestamp === 0) {
            $this->timestamp = $this->generateTimestamp();
        }
        return $this;
    }
public function setTimestamp($timestamp = 0)
    {
        $this->timestamp = $timestamp;
        if ($timestamp === 0) {
            $this->timestamp = $this->generateTimestamp();
        }
        return $this;
    }
public function setTimestamp ( $ timestamp = 0 ) { $ this -> timestamp = $ timestamp ; if ( $ timestamp === 0 ) { $ this -> timestamp = $ this -> generateTimestamp ( ) ; } return $ this ; }
Method to set the timestamp parameter for the signature

@param int $timestamp
Method to set the timestamp parameter for the signature