I want send messagCreate an Windows app to send message through WhatsApp

I want send message to clinet through WhatsApp Business API i have already a C# winidows application to manage clinet CRM , need send some notification/information throug whatsapp . scope of work set up WhatsApp Business API and realted account Create a windows appp to send message , ( two test box , wahtsapp number , text and a send button) location - UAE (DUBAI)