Initialization

You need to initialization class object, using constructor.

 const accessToken ='EAAGp6aTb8.....';
 const fromNumberId = '1082772452xxxxx';

 final whatsapp = WhatsApp(accessToken, fromNumberId);

param	type	required	description
accessToken	string	yes	Access token of your Facebook App
fromNumberId	string	yes	Phone Number id of your whatsapp business