Gravity Forms: Use WooCommerce emails templates for notifications

gravity-forms-use-woocommerce-email-template-for-notifications.php

<?php

/**
 * Gravity Forms: Use WooCommerce emails templates for notifications.
 *
 * @param string $template
 *
 * @return string
 */
public function custom_gform_html_message_template_pre_send_email( string $template ) {

  if ( function_exists( 'wc_get_template_html' ) && class_exists( 'WC_Email' ) ) {

    $header = wc_get_template_html(
      'emails/email-header.php',
      array(
        'email_heading' => '{subject}',
      )
    );
      
    $footer = wc_get_template_html( 'emails/email-footer.php' );

    $wc_email          = new WC_Email();
    $template = $wc_email->style_inline( $header . '{message}' . $footer );
  }

  return $template;
}
add_filter( 'gform_html_message_template_pre_send_email', 'custom_gform_html_message_template_pre_send_email', 20, 1 );

Thanks for the snippet!

I've made a simple improvement

WC_Email class is not present until you init WC_Emails class.

function custom_gform_html_message_template_pre_send_email(string $template) {
    $wcEmails = new WC_Emails();
    $wcEmails->init();

    if (function_exists('wc_get_template_html') && class_exists('WC_Email')) {
        $header = wc_get_template_html(
            'emails/email-header.php',
            [
                'email_heading' => '{subject}',
            ]
        );

        $footer = wc_get_template_html('emails/email-footer.php');

        $wc_email = new WC_Email();
        $template = $wc_email->style_inline($header . '{message}' . $footer);
    }

    return $template;
}
add_filter('gform_html_message_template_pre_send_email', 'custom_gform_html_message_template_pre_send_email', 20, 1);