I'm trying to read conversations of my page but after creating a new "TestApp" on facebook I am not able to read the conversations of my page.
I used the Graph API Explorer for generating the Page Access Token but when I try to get the conversations of my page, the calls (graph.facebook.com/{my_page_id}/conversations) returns only the following fields: updated_time, link, id.
How can I retrieve the messages of any conversation_id returned by API? The API version used are 2.4.
In v2.4 you need to declare the fields you want in the response.
To retrieve all fields from the conversations endpoint you need to execute the following:
https://graph.facebook.com/v2.4/{page-id}/conversations?fields=snippet,updated_time,message_count,unread_count, tags, participants,senders,can_reply,is_subscribed
References
Declarative Fields https://developers.facebook.com/docs/apps/changelog#v2_4_changes
Conversation Endpoint https://developers.facebook.com/docs/graph-api/reference/v2.4/conversation/