Question

I wonder if someone can answer this;

I have a canvas app, which in turn allows the user of the app to attach another app into their page tab. Everything works great. The page tab is now running from the users account.
If a ‘Viewer’ interacts with that app on the users page tab, i know I cannot get their user id, but how can I get the actual URL of that page they are on, so I can update Pinterest for the ‘Viewer’.
Some people state that I need to access the signed request and some say the graph for the Page ID. Which one is the correct way to get the Page ID, or does it even matter ?

Thank you

Answer 1

Take in account that your app always will receive the signed_request var from FB. So why don’t use it? Using php-sdk you can obtain it like this:

$signed_request = $facebook->getSignedRequest();

// so for the page ID you do:
$page_id = $signed_request['page']['id'];