WooCommerce | Add custom text above the Order Table in the Order Complete email

woocommerce-order-complete-email-text.php

<?php

add_action( 'woocommerce_email_before_order_table', 'add_content', 20, 4 );
function add_content($order, $sent_to_admin, $plain_text, $email) {
	// Adds to "completed order" email only
	if ( $email->id == 'customer_completed_order' ) {
		echo '<h2 id="h2thanks">Access Your Courses</h2><p id="pthanks">Thank you for making this purchase! You can now view your courses online by clicking <a href="https://courses.example.com/my-courses/" target="_blank">here</a>!</p>';
	}
}