How to use WhatsApp Widget, PHP and WhatsApp WebInventory.in How to use WhatsApp Widget, PHP and WhatsApp Create a good point of sale with these tools to generate invoices, reports and payments. http://webinventory.in/ 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.