how to get USERID when user accept the request Facebook apprequests - facebook

Question

i am using facebook apprequests to inviting friends as below
function invitefriends()
{
FB.init({
appId:'XXXXXXX', cookie:true,
status:true, xfbml:true
});
FB.ui({ method: 'apprequests',
message: 'Here is a new Requests dialog...'});
}
</script>
But how get friend id once he accept the request i am able to get below when user accept request
https://apps.facebook.com/XXXXXX/?request_ids=XXXXXXX&ref=notif&app_request_type=user_to_user&notif_t=app_request
from above i can get from userid but how to get userid who accept request
i tried to pass request_ids with redirect_uri but once user install application it get disappeared.

Answer 1

Looking at the Requests documentation, whenever a user uses your app to send a request, they are redirect post-send to your app with ?request=REQUEST_ID&to=ARRAY_OF_USER_IDS appended to the redirect_uri.
So, once you should setup your redirect URI to capture the request ID and the UID array and store it for later.
Then, when the user who received the request accepts it, they'll be directed to a URL similar to the following:
https://apps.facebook.com/APPNAME/?request_ids=REQUEST_ID&ref=notif&app_request_type=user_to_user&notif_t=app_request
You can then compare the request_id received here to the request ID you've already stored and then once the user has accepted and dropped onto your App, you'll receive a signed request which you can parse to retrieve their User ID.