The Merriam-Webster Dictionary defines a “requester” as one who makes a request or asks something of another (source). Most often, the requester is after some form of an official document. As a result, people most often use “requester” to describe an interaction between two people.

Should I use requestor or requester?

requestor is used in law. requester is for common usage.

What is the difference between requestor and requester?

As can be expected, a “requester” is defined as a person or thing that is making a request. ... This is because “requestor” is a technology-related word that has the same sort of definition as “requester”, but which applies to technology kinds of requests.