by Prabal Mallick on WordPress.org
Safeguard is an SMS & Email based OTP service provider plugin. Also available woocommerce transactional alert.

Install the plugin.
Secure your WordPress site with WordPress Safegaurd.
WordPress Safegaurd provides 2-step verification on login. Once a user submits their login credentials, a One Time Pin (OTP) will be sent to them via SMS/Email. They will enter this OTP in order to continue to login. All it customer will able to get Woocommerce order alert notification via SMS.
Stop Brute force hacking attempts, and keep your data safe!
* Easy to install!
* Email & SMS both are integrated
* Any SMS API can be Configurable
* WordPress 4.0 Ready!