Facebook Graph API get First and Last name from PSID? - facebook

Question

I have setup a FB Webhook to notify my technicians when a user messages my business page. The notification works and I get the message and the sender's ID (PSID) but I can't seem to get the sender's first and last name per the documentation found here :
https://developers.facebook.com/docs/messenger-platform/identity/user-profile
I have been granted Advanced Access with the "Business Asset User Profile Access" as required.
The App is in Live mode (not development mode)
Messaging permissions are granted
I need to turn the returned "Sender ID (PSID)" into a First and Last name. According to the documentation, I need to send a request like this :
curl -X GET "https://graph.facebook.com/<PSID>?fields=first_name,last_name,profile_pic&access_token=<PAGE_ACCESS_TOKEN>"
So my code looks like this :
function get_basic_info($id, $access) {
$url = 'https://graph.facebook.com/'.$id.'?fields=first_name,last_name,profile_pic&access_token='.$access;
$info = json_decode(file_get_contents($url), true);
return $info;
}
I would then call the function using : $fbuser = get_basic_info($sender, $fb_access_token);
This will ALWAYS return NULL when messaging my business page from any Facebook account.... except from my personal account which owns the business page. If I message my business account from my personal account that owns the business, this is what I get back :
{"first_name":"Tim","last_name":"My_Last_Name","profile_pic":"Profile_Picture_URL","id":"My_FB_ID"}
The access token I am using is generated from the App Dashboard > My_App > Messenger (under Products, left side) > Settings > Access Tokens > Generate Token (Next to the Business Page I own).
What am I doing wrong? It works when I personally message my own business page, but not when anyone else messages. Thank you for ANY help!

Answer 1

So to update this with an answer for those who may be looking, here it goes.... Don't use the Sender ID (PSID) as the documentation states, use the Message ID.
function get_basic_info($id, $access) {
$url = 'https://graph.facebook.com/'.$id.'?fields=from&access_token='.$access;
$info = json_decode(file_get_contents($url), true);
return $info;
}
Usage :
$fbuser = get_basic_info($message_id, $FB_PAGE_ACCESS_TOKEN);
$fb_name = $fbuser['from']['name'];
Unfortunately, you cannot get the Profile Picture, but this is as far as I needed to get anyways.
Enjoy!