noun
Refers to a person who subscribes to a publication such as a newspaper, magazine, or online service. Can also mean a regular reader or buyer.
この新聞の購読者は年々減っている。
The number of subscribers to this newspaper is decreasing year by year.
雑誌の購読者にプレゼントが当たるキャンペーン
We are running a campaign where magazine subscribers can win a gift.
会員 is a member of an organization or service, not necessarily a subscriber to a publication.
Compound of 購読 (kōdoku, 'subscription') + 者 (sha, 'person').