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I'm trying to connect messenger bot and dialogflow. The idea is - when you click on the button, service is redirecting you to the me link (example: http://m.me/2010070995927131?ref=initial_message_with_param) then dialoglflow receives initial_message_with_param as message and fullfilment can generate the response.
Sending messages works at all but unfortunately, ref param doesn't. Do you have any ideas why ref param is ignored on Dialogflow side?
Been few months, but i just came across here.
Under the "Edit Page Subscription Fields" in Messaging > Webhook in Facebook developers, you need to enable messaging_referrals to receive referral payload calls.