Extend email templates

In the AbanteCart admin panel go to the Design > Email templates and add a new variable name to the Allowed Placeholders
NOTE: We do not recommend using a visual editor for email template editing. This will break the template. This issue will be address in the future version of AbanteCart.
Search in the AbanteCart PHP code for the required email template text_id
In your extension code, create a hook to add a new value to the email template data array ‘mail_template_data’.

Public function onModelCheckoutOrder__ProcessData()
{
  $that = &$this->baseObject;
  $that->data['mail_template_data']['foo'] = 'bar';
}