Does anyone know how to get the link that was posted on Facebook via callback ?
I want to know which link was generated when the user shared it, so I can validate it and even see if it actually made a share.
Having this information I can save it to the bank, including auditing.
I did not find this information in Facebook documentation so far
According to this answer in SOEN, and also assuming you are using the Facebook API, you can process the values of the links entry returned by OpenGraph, accessible from:
https://graph.facebook.com/userID/links?access_token=<access_token>
Being your use authorization key.
Iterate the returned links (apparently a collection of information) and analyze the value of the link (singular) entry.
A consideration made by the author of the original response is that even if you set a high limit for the number of results, you may still have to deal with pageings.