The purpose of a(n) payment is to facilitate the performance of duties that a government has already obligated itself to do.

grease

Explanation:

A facilitation payment that contains the small bribe is called as the grease payment that solicited to expedite the performance of the transactions that are done on regularly basis or the service in which the company makes the payment is considered to be legal at the time of receiving it

So as per the given situation, it is a grease payment where the government has already the liability to do