Add custom content (HTML, Script) in thank you page

Source

File : wp-travel-pro/inc/modules/utilities-core/inc/class-wp-travel-utilities-shortcodes.php

Parameters : $booking_id, $payment_id, $trip_price

Example:

if ( isset( $_GET['order_id'] ) && ! empty( $_GET['order_id'] ) ) {
        $booking_id = $_GET['order_id'];
        $payment_id   = get_post_meta( $booking_id, 'wp_travel_payment_id', true );
	$trip_price  = get_post_meta( $payment_id, 'wp_travel_trip_price', true );
        error_log( print_r( 'booking id ' . $booking_id, true ) );
        error_log( print_r( 'payment id ' . $payment_id, true ) );
        // Here you can use $trip_price as your amount param and $booking_id as order id
        ?>
        <script>
            var booking_id = '<?php echo $booking_id; ?>';
            var trip_price = '<?php echo $trip_price; ?>';
            var ttConversionOptions = ttConversionOptions || [];
        </script>
        <?php
    }
}
add_action( 'wptravel_after_thankyou_page_content', 'wptravel_customized_thankyou_page_additional_fields' );