subscriber

One who subscribes, in any sense of that word.

One who subscribes; one who contributes to an undertaking by subscribing.

One who enters his name for a paper, book, map, or the like.

a person who subscribes to a publication or a service

someone who contributes (or promises to contribute) a sum of money

someone who expresses strong approval

someone who contracts to receive and pay for a service or a certain number of issues of a publication