Code snippet for send SMS using Twilio SMS Notifications plugin when shipment status has changed from TrackShip

ast_trigger_ts_status_change.php

<?php
add_action( 'ast_trigger_ts_status_change', 'ast_send_status_change_sms_twillio', 10, 3 );
function ast_send_status_change_sms_twillio($order_id, $old_status, $new_status){
	$wc_ast_api_key = get_option('wc_ast_api_key');
	$blog_title = get_bloginfo();
	if ( !is_plugin_active( 'woo-advanced-shipment-tracking/woocommerce-advanced-shipment-tracking.php' ) ) {
		return;
	}	
	if( !$wc_ast_api_key ){
		return;
	}
	if( $old_status != $new_status){		
		$new_status = apply_filters( "trackship_status_filter", $new_status );
		$message = 'Hi there. we thought you’d like to know that your recent order - #'.$order_id.' from '.$blog_title.' is '.$new_status.'.';
		$sms_notification = new WC_Twilio_SMS_Notification($order_id);
		$sms_notification->send_manual_customer_notification($message);		
	}	
}