"Requerer" = apply FOR.
There are multiple definitions - click on the translation that matches your context.
to have a connection with or to be relevant to somebody or something; to put something (eg a law) into operation
Since the accident took place in Ontario and both the plaintiff and the defendant are Ontario residents, Ontario law must apply.
to make a formal request for something (often a written request)
A vicar is to apply for a drinks licence so he can serve wine and beer at his small village church.