Sending Booking Confirmation Email After the Order Receieved - Product setup without confirmtion.

functions.php

<?php

/**
 * This will send the Booking Confirmation email to customer even if the product is not setup with the requires confirmation option.
 *
 * @param int $order_id Order Id.
 */
function bkap_send_booking_confirmation( $order_id ) {

	if ( ! $order_id )
		return;

	// Allow code execution only once.
	if ( ! get_post_meta( $order_id, '_thankyou_action_done', true ) ) {

		// Get an instance of the WC_Order object.
		$order = wc_get_order( $order_id );
		$booking_present = false;
		// Loop through order items.
		foreach ( $order->get_items() as $item_id => $item ) {

			$booking_id = bkap_common::get_booking_id( $item_id );

			if ( $booking_id ) {
				$booking_present = true;
				$wc_email   = WC_Emails::instance();
				$email      = $wc_email->emails['BKAP_Email_Booking_Confirmed'];
				$email->trigger( $item_id, $booking_id );
				do_action( 'bkap_booking_is_confirmed', $booking_id );
			}
		}

		if ( $booking_present ) {
			// Flag the action as done (to avoid repetitions on reload for example).
			$order->update_meta_data( '_thankyou_action_done', true );
			$order->save();
		}
	}
}
add_action( 'woocommerce_thankyou', 'bkap_send_booking_confirmation', 10, 1 );