templates/emails/plain/tracking-info.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

if ( $tracking_items ) {

    $wcast_customizer_settings = new wcast_initialise_customizer_settings();
    $ast = new WC_Advanced_Shipment_Tracking_Actions;
    $tracking_info_settings = get_option('tracking_info_settings');

    if ( $tracking_info_settings['header_text_change'] ) {
        $shipment_tracking_header = $tracking_info_settings['header_text_change'];
    } else {
        $shipment_tracking_header = "Tracking Information";
    }

    if ( $tracking_info_settings['additional_header_text'] ) {
        $shipment_tracking_header_text = $tracking_info_settings['additional_header_text'];
    }

    $provider_header_text = $ast->get_option_value_from_array( 'tracking_info_settings', 'provider_header_text', $wcast_customizer_settings->defaults['provider_header_text'] );

    $tracking_number_header_text = $ast->get_option_value_from_array( 'tracking_info_settings', 'tracking_number_header_text', $wcast_customizer_settings->defaults['tracking_number_header_text'] );

    $track_header_text = $ast->get_option_value_from_array( 'tracking_info_settings', 'track_header_text', $wcast_customizer_settings->defaults['track_header_text'] );

    echo strtoupper( apply_filters( 'woocommerce_shipment_tracking_my_orders_title', __( $shipment_tracking_header, 'woo-advanced-shipment-tracking' ) ) ) . "\n\n";

    if ( isset( $shipment_tracking_header_text ) ) {
        echo $shipment_tracking_header_text . "\n\n";
    }

    if ( isset( $new_status ) ) {
        echo sprintf( __( 'Shipment status changed to %s', 'woo-advanced-shipment-tracking' ), apply_filters( "trackship_status_filter", $new_status ) ) . "\n\n";
    }

    foreach ( $tracking_items as $tracking_item ) {
        $url = str_replace( '%number%', $tracking_item['tracking_number'], $tracking_item['formatted_tracking_link'] );
        echo __( $provider_header_text, 'woo-advanced-shipment-tracking' ) . ": " . apply_filters( 'ast_provider_title', esc_html( $tracking_item['formatted_tracking_provider'] ) ) . "\n";
        echo __( $tracking_number_header_text, 'woo-advanced-shipment-tracking' ) . ": " . esc_html( $tracking_item['tracking_number'] ) . "\n";
        echo __( $track_header_text, 'woo-advanced-shipment-tracking' ) . ": " . esc_url( $url ) . "\n\n";
    }

    echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n";
}