Wordpress SMS API integration without plugin

I am struggling with SMS sending in WordPress without plugin, I have a, API, but that API is not working. Example:

function mysite_woocommerce_order_status_processing( $order_id ) {

$mobile="123456";

$url="****/api.php?username=******&password=1234&source=UPDATE&dmobile=".$mobile."&message='.$msg.' ";

$response = wp_remote_get( $url ); //print_r($response);

} add_action( 'woocommerce_order_status_processing','mysite_woocommerce_order_status_processing' );

I am struggling with above hook, I can send Email through that hook, but not SMS. It would be great if any WordPress developer help me out !

Getting SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

via Chebli Mohamed