If a heavyweight boxing champion retires how does the new one get to be champion

When a heavyweight boxing champion retires, the process of determining a new champion involves several steps:

Interim Title Match: The boxing federations (e.g., WBC, WBA, IBF, WBO) typically hold an interim title match between the top-ranked contenders. The winner of this match becomes the interim champion.
Mandatory Defense: The interim champion must defend his title successfully against the next top-ranked contender. If he wins, he becomes the full-fledged champion.
Unification: If there are multiple heavyweight champions recognized by different federations, unification fights can be organized to determine an undisputed champion.
Vacancy: If a champion vacates his title for any reason (e.g., retirement, injury, suspension), the federations may hold a tournament or appoint the next top-ranked contender as the new champion.

What does an interim title represent? It's a temporary designation held by a boxer who is a step away from becoming the full champion.
Can an interim champion become the full champion without fighting the actual champion? Yes, if the actual champion retires or vacates the title, the interim champion automatically becomes the full champion.
What is the difference between a unification fight and a title fight? A unification fight involves two or more champions from different federations, whereas a title fight is between the reigning champion and a challenger.
How does a boxer become the top-ranked contender? By winning fights and accumulating points in the rankings system maintained by the boxing federations.
What happens if a champion refuses to fight a mandatory challenger? The federations can strip the champion of his title and award it to the challenger.

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If a Heavyweight Boxing Champion Retires, How Does the New One Get to Be Champion?