Messenger Link

Each page will have a Messenger Link or tiny URL which helps you to include the link on a flyer, in an email, in a QR code or in an SMS message. Your Messenger link directs people to a conversation with your messenger bot

https://m.me/yourpage-username?ref=Call

yourpage-name replace with your page username

ref is an optional parameter and when a person clicks or scans an m.me link that contains a ref parameter and is taken into an existing conversation thread, it will now open the 24hr standard messaging window.

You can set ref=smart reply keywords so the user get engaged with relevant messages, this is very useful for running messenger ads in facebook, sharing link with SMS & Email. This also helps you to redirect a user into correct context of a conversation.

If you are using Smart Replies then you can generate a direct URL right from Smart Replies. Click Here for more details