Are you
the id?
A payment for the kings,
With help from John, quid, qu-id!
A child of rock who sings,
Kid Rock, k-id
The sign says you can't do it,
A sign might say trespassing is forbidden, forb-id-den
In Spain, you might go through it.
Madrid is a city in Spain, Madr-id
You will find me in a void,
The word 'id' is in the word 'void', vo-id
I was coined by Sigmund Freud,'
He invented the concept of the id, the ego, and the superego
Above you'll find me in each of these,
Points out that the answers to the first stanza contain the word 'id'
If three is easy, I'm a breeze.
Might be an id-ego-superego reference? John helped again, 'id' only has two letters.
Title clue:
The village Id-iot