How to use WhatsApp Widget, Link to WhatsApp Opencart WhatsApp Extension You can use WhatsApp Widget as your Opencart WhatsApp free extension. Opencart is a fantastic CMS to create your online store, and now you can add WhatsApp to your online store. It is very easy to use and takes 5 minutes to configure it. Just create your account and try now. How to use WhatsApp Widget, Link to WhatsApp By César Martín (ToChat.be) We develop WhatsApp solutions, WhatsApp API and WhatsApp Widgets. Please contact us for more information. We are here to help you. View all of César Martín (ToChat.be)'s posts.