public function sendLetter( $templateId, array $personalisation = array(), $reference = '' ){

        $payload = $this->buildPayload( 'letter', '', $templateId, $personalisation, $reference );

        return $this->httpPost(
            self::PATH_NOTIFICATION_SEND_LETTER,
            $payload
        );

    }
public function sendLetter( $templateId, array $personalisation = array(), $reference = '' ){

        $payload = $this->buildPayload( 'letter', '', $templateId, $personalisation, $reference );

        return $this->httpPost(
            self::PATH_NOTIFICATION_SEND_LETTER,
            $payload
        );

    }
public function sendLetter ( $ templateId , array $ personalisation = array ( ) , $ reference = '' ) { $ payload = $ this -> buildPayload ( 'letter' , '' , $ templateId , $ personalisation , $ reference ) ; return $ this -> httpPost ( self :: PATH_NOTIFICATION_SEND_LETTER , $ payload ) ; }
Send a Letter

@param string    $templateId
@param array     $personalisation
@param string    $reference

@return array
Send a Letter