Facebook application_id

hi, i’d like my app to the facebook. i’d like to pay facebook. when i send to them test my app - Facebook answear to me alert: wrong field facebook application_id. What is it ? and where can i this put id ?

THX for answear.

Why not ask them. They gave you this answer?

You usually find this in your app’s settings on the Facebook Developer Portal. Make sure to check the correct field and ensure the ID is entered accurately.