Our team has built Facebook messenger for subscribers. We are releasing a beta version and we want to pick up 5% for getting feedback. The challenge is how can we verify which subs have Facebook Messenger installed on their devices?
Thanks in advance.
If you have phone numbers for the subscribers you can use the Customer Matching API. https://developers.facebook.com/docs/messenger-platform/customer-matching
If you don't, you can try to get them to interact with your bot with a Send To Messenger button or one of the other web plugins. https://developers.facebook.com/docs/messenger-platform/plugin-reference/send-to-messenger