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Is the Facebook app id limited global?

Since Facebook makes different identifiers for the same user in different applications in API V2.0, we need to change our attachment systems to match this.

Due to the fact that I want to make fewer changes in our system, I need to know if the global unique identifier of the application is in the Facebook application, in other words, there were two applications, will there be a conflict of conflicts when I save only the user id of the application in one and the same hash?

See below for more details.

I have two applications in business, so each application can get the application identifier for the other. I already have a system that stores a unique index of user information using a user ID with the application in the First application. Now I need to save the data of these two applications in one MySQL table, and we use the ids_for_business API to confirm whether the same user is registered in another application to decide whether to register a new register or register as a new user of our system. If the application identifier is limited to globally unique, we could just act like what I'm saying. But if the application identifier is the same for different users,our user system will identify another user as the same user in our system, so we need to make big changes to follow Facebook.

Help me please...

Example, for example, the UserA identifier in AppC is 33, will the UserB identifier in AppD be 33?

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Yes, identifiers are globally unique:

The identifier that you get for a specific user who has logged into your application or granted you permission will not change. Two applications never get the same identifier to refer to different users. The application scope identifier is globally limited and refers to a specific pair {application, user}

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