Can't add {message} variable to order_conf mail template - php

Question

On my classes/PaymentModule.php I have declared '{message}' => $customer_message (between other vars) but still my customers see Wiadomość: {message}
in mails which they recieved.
What do I wrong? Maybe declare {message} var in PaymentModule.php is not enough?
UDPATE:
this is standard PaymentModule.php code in Prestashop 1.6.2.1 with added {message} variable:
$customer_message = $order->getFirstMessage();
$data = array(
'{firstname}' => $this->context->customer->firstname,
'{lastname}' => $this->context->customer->lastname,
'{email}' => $this->context->customer->email,
'{delivery_block_txt}' => $this->_getFormatedAddress($delivery, "\n"),
'{invoice_block_txt}' => $this->_getFormatedAddress($invoice, "\n"),
'{delivery_block_html}' => $this->_getFormatedAddress($delivery, '<br />', array(
'firstname' => '<span style="font-weight:bold;">%s</span>',
'lastname' => '<span style="font-weight:bold;">%s</span>'
)),
'{invoice_block_html}' => $this->_getFormatedAddress($invoice, '<br />', array(
'firstname' => '<span style="font-weight:bold;">%s</span>',
'lastname' => '<span style="font-weight:bold;">%s</span>'
)),
'{delivery_company}' => $delivery->company,
'{delivery_firstname}' => $delivery->firstname,
'{delivery_lastname}' => $delivery->lastname,
'{delivery_address1}' => $delivery->address1,
'{delivery_address2}' => $delivery->address2,
'{delivery_city}' => $delivery->city,
'{delivery_postal_code}' => $delivery->postcode,
'{delivery_country}' => $delivery->country,
'{delivery_state}' => $delivery->id_state ? $delivery_state->name : '',
'{delivery_phone}' => ($delivery->phone) ? $delivery->phone : $delivery->phone_mobile,
'{delivery_other}' => $delivery->other,
'{invoice_company}' => $invoice->company,
'{invoice_vat_number}' => $invoice->vat_number,
'{invoice_firstname}' => $invoice->firstname,
'{invoice_lastname}' => $invoice->lastname,
'{invoice_address2}' => $invoice->address2,
'{invoice_address1}' => $invoice->address1,
'{invoice_city}' => $invoice->city,
'{invoice_postal_code}' => $invoice->postcode,
'{invoice_country}' => $invoice->country,
'{invoice_state}' => $invoice->id_state ? $invoice_state->name : '',
'{invoice_phone}' => ($invoice->phone) ? $invoice->phone : $invoice->phone_mobile,
'{invoice_other}' => $invoice->other,
'{order_name}' => $order->getUniqReference(),
'{date}' => Tools::displayDate(date('Y-m-d H:i:s'), null, 1),
'{carrier}' => ($virtual_product || !isset($carrier->name)) ? Tools::displayError('No carrier') : $carrier->name,
'{payment}' => Tools::substr($order->payment, 0, 32),
'{products}' => $product_list_html,
'{products_txt}' => $product_list_txt,
'{discounts}' => $cart_rules_list_html,
'{discounts_txt}' => $cart_rules_list_txt,
'{total_paid}' => Tools::displayPrice($order->total_paid, $this->context->currency, false),
'{total_products}' => Tools::displayPrice(Product::getTaxCalculationMethod() == PS_TAX_EXC ? $order->total_products : $order->total_products_wt, $this->context->currency, false),
'{total_discounts}' => Tools::displayPrice($order->total_discounts, $this->context->currency, false),
'{total_shipping}' => Tools::displayPrice($order->total_shipping, $this->context->currency, false),
'{total_wrapping}' => Tools::displayPrice($order->total_wrapping, $this->context->currency, false),
'{message}' => $customer_message,
'{total_tax_paid}' => Tools::displayPrice(($order->total_products_wt - $order->total_products) + ($order->total_shipping_tax_incl - $order->total_shipping_tax_excl), $this->context->currency, false));
In order_conf.html:
...
Wiadomość: {message}
....

Answer 1

ou should use below function if not already using it.
Example:
$id_lang = (int)$this->context->language->id;
$heading = Mail::l('Message Received', (int)$id_lang);
Mail::Send(
(int)$id_lang,
'order_conf',
$heading,
$data,
$this->context->customer->email,
null,
null,
$this->context->shop->name,
null,
null,
_PS_MODULE_DIR_.'mymodule/mail/',
false,
1
);
mail template should be located in 'mymodule/mail/en/order_conf.html' make languages directories according to your languages like /en , /fr, /nl

Answer 2

With Prestashop 1.7, I’ve tested with
'{message}' => 'hello',
And it displays in email : hello
Are you sure you have something in $customer_message ?
It can be more complicated with some variables. Have a look at $product_list_html
You will see it is an array and there is :
$product_list_html = $this->getEmailTemplateContent('order_conf_product_list.tpl', Mail::TYPE_HTML, $product_var_tpl_list);
It uses an other template to build the list of product (order_conf_product_list.tpl)

Answer 3

I know that post is 3 years old but the solution is not using
$customer_message
but
$customer_message->message