To track Messenger open rates Audience Republic has changed how fans opt-in to your Messenger brand.
When fans subscribe to your Messenger they will be sent an automated message from your brand like the below. You don't need to setup these messages, they are auto-created when you connect your account to the campaign and will appear in your Facebook Inbox. These messages are only sent when fans tap "Subscribe to Messenger" in a campaign, there are no other auto-response messages sent.
Fans officially opt-in for Messenger when they tap "Earn 10 Points" or reply to the message, which then enables Audience Republic to track opens on any future message you send them.
When fans opt-in, you can then send them Messages from the Audience Republic Message Center.