Kdjykuj

I created a custom email and it's working fine like this:

    $data['amount'] = round($amount);

    $data['customer_name'] = $customer->getFirstname() . ' ' . $customer->getLastname();

    $data['customer_telephone'] = $customer->getMainTelephone();

    $data['customer_email'] = $customer->getEmail();

    $data['customer_credit_balance'] = round($creditBalance);

    $data['requested_at'] = $model->getRequestedAt();

    $data['customer_bank_account'] = $description;

    $storeName = $this->getStoreName();

    $storeEmail = $this->getStoreEmail();

    $senderInfo = [

        'name' => $storeName,

        'email' => $storeEmail

    ];

    $receiverInfo = [

          'name' => $data['customer_name'],

          'email' => $data['customer_email']

    ];

    $this->emailHelper->sendMail(

        $data,

        $senderInfo,

        $receiverInfo,

        'approve'

    );





   //emailHelper

  public function sendMail($emailTemplateVariables,$senderInfo,$receiverInfo,$type)

    {

        if ($type == 'request') {

          $typeId = self::XML_PATH_EMAIL_TEMPLATE_FIELD_REQUEST;

        } elseif ($type == 'approve') {

          $typeId = self::XML_PATH_EMAIL_TEMPLATE_FIELD_APPROVE;

        } else{

          $typeId = self::XML_PATH_EMAIL_TEMPLATE_FIELD_REJECT;

        }

        $this->temp_id = $this->getTemplateId($typeId);

        $this->inlineTranslation->suspend();

        $this->generateTemplate($emailTemplateVariables,$senderInfo,$receiverInfo);

        $transport = $this->_transportBuilder->getTransport();

        $transport->sendMessage();

        $this->inlineTranslation->resume();

    }

template:

 <!--@subject Your Request is Approved @-->

<!--@vars

{"htmlescape var=$name":"Recipient Name",

"htmlescape var=$sendername":"Sender name",

"var code":"Gift Card Code",

"var balance":"Gift Card Balance",

"var status":"Status",

"htmlescape var=$message":"Message",

"var expiredat":"Expired At"}

@-->



<!--@styles

body,td { background:#FFFFFF; margin:0; padding:0; color:#2f2f2f; font:13px/1.35em Verdana, Arial, Helvetica, sans-serif; }

pre{ white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;}

@-->

{{template config_path="design/email/header_template"}}

<div style="font:13px/1.35em Verdana, Arial, Helvetica, sans-serif;">

    <table cellspacing="0" cellpadding="0" border="0" width="98%"

           style="margin-top:10px; font:11px/1.35em Verdana, Arial, Helvetica, sans-serif; margin-bottom:10px;">

        <tr>

            <td align="center" valign="top">

                <!-- [ middle starts here] -->

                <table cellspacing="0" cellpadding="0" border="0" width="660">

                    <tr>

                        <td valign="top">

                            <p>

                                <strong>Dear {{var customer_name}},</strong>,<br/>

                                Your request to process {{var amount}} has been approved and processed.</br> 

                            </p>

                        </td>

                    </tr>

                </table>

            </td>

        </tr>

    </table>

</div>

if i have invoice id as a variable, how can i attach my pdf invoice to this email?