Tracking Info to WooCommerce order - Use CMB2 to add a custom metabox to add tracking information to WooCommerce orders. The information is then added to the "Completed Order" email. https://www.damiencarbery.com/2020/01/add-tracking-info-to-woocommerce-order/

tracking-info-to-wc-order.php

<?php
/*
Plugin Name: Tracking Info to WooCommerce order
Plugin URI: https://www.damiencarbery.com/2020/01/add-tracking-info-to-woocommerce-order/
Description: Use CMB2 to add a custom metabox to add tracking information to WooCommerce orders. The information is then added to the "Completed Order" email.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.2

$Id: tracking-info-to-wc-order.php 4947 2020-01-04 14:52:28Z damien $
*/


// Add the metabox to allow for manual entering (or editing) of tracking information.
add_action( 'cmb2_admin_init', 'dcwd_order_metabox' );
function dcwd_order_metabox() {
	$cmb = new_cmb2_box( array(
		'id'            => 'order_tracking_info',
		'title'         => 'Tracking Information',
		'object_types'  => array( 'shop_order', ), // Post type
		'context'       => 'side',
		'priority'      => 'high',
		'show_names'    => true, // Show field names on the left
	) );
	$cmb->add_field( array(
		'name'  => 'Tracking number',
		'id'    => 'tracking_number',
		'type'  => 'text',
	) );
	$cmb->add_field( array(
		'name'       => 'Tracking URL',
		'id'         => 'tracking_url',
		'type'       => 'text_url',
		'protocols'  => array( 'http', 'https' ),
	) );
}


// Examine the tracking url and return a provider name.
function dcwd_get_tracking_provider_from_url( $url ) {
	if ( strpos( $url, 'usps.com' ) !== false ) {
		return 'USPS';
	}
	if ( strpos( $url, 'fedex.com' ) !== false ) {
		return 'FexEd';
	}
	if ( strpos( $url, 'ups.com' ) !== false ) {
		return 'UPS';
	}
	// Add more as necessary.
	
	// Unknown provider.
	return null;
}


// If available, include the tracking information in the Completed Order email.
//add_action( 'woocommerce_email_order_details', 'dcwd_add_tracking_info_to_order_completed_email', 5, 4 ); 
function dcwd_add_tracking_info_to_order_completed_email( $order, $sent_to_admin, $plain_text, $email ) {
/*	// Only customers need to know about the tracking information.
	if ( ! $sent_to_admin ) {
		return;
	}
*/
	if ( 'customer_completed_order' == $email->id ) {
		$order_id = $order->get_id();
		$tracking_number = get_post_meta( $order_id, 'tracking_number', true );
		$tracking_url = get_post_meta( $order_id, 'tracking_url', true );
		
		// Quit if either tracking field is empty.
		if ( empty( $tracking_number ) || empty( $tracking_url ) ) {
			return;
		}
		
		$tracking_provider = dcwd_get_tracking_provider_from_url( $tracking_url );

		if ( $plain_text ) {
			if ( ! empty( $tracking_provider ) ) {
				printf( "\nYour order has been shipped with %s. The tracking number is %s and you can track it at %s.\n", $tracking_provider, esc_html( $tracking_number ), esc_url( $tracking_url, array( 'http', 'https' ) ) );
			}
			else {
				printf( "\nYour order has been shipped. The tracking number is %s and you can track it at %s.\n", esc_html( $tracking_number ), esc_url( $tracking_url, array( 'http', 'https' ) ) );
			}
		}
		else {
			if ( ! empty( $tracking_provider ) ) {
				printf( '<p>Your order has been shipped with <strong>%s</strong>. The tracking number is <strong><a href="%s">%s</a></strong>.</p>', $tracking_provider, esc_url( $tracking_url, array( 'http', 'https' ) ), esc_html( $tracking_number ) );
			}
			else {
				printf( '<p>Your order has been shipped. The tracking number is <strong><a href="%s">%s</a></strong>.</p>', esc_url( $tracking_url, array( 'http', 'https' ) ), esc_html( $tracking_number ) );
			}
		}
	}
}