Whatsapp, Facebook, Instagram have a 24-hour rule. This rule means that after correspondence with a person, after 24 hours the possibility of sending messages to him/her is closed. But, it was in Whatsapp that such a function as approval of templates for opening the possibility of sending messages outside the 24-hour window appeared. We implemented this function through the Twillio provider together with the possibility of sending Whatsapp messages with buttons and links.