Redirect customer to a custom thank you page. (original: https://gist.github.com/bernattorras/b1c3643a350dcf1be83ac3b8efe5068d)

woo_custom_redirect_after_purchase.php

<?php

/** 
 * Function to redirect the customer to a custom 'thank you' page after placing an order
**/
add_action( 'template_redirect', 'woo_custom_redirect_after_purchase' );
function woo_custom_redirect_after_purchase() {
	global $wp;
	if ( is_checkout() && !empty( $wp->query_vars['order-received'] ) ) {
		wp_redirect( ' http://localhost:8888/subscriptions/custom-thank-you-page/' );
		exit;
	}
}