"To purchase a subscription" means to pay for a service or product on a recurring basis for a specific period of time, such as a week, a month, or a year. Full definition
If you want to contact the member you would then have to purchase a subscription for a low monthly fee. (datingsitesreviews.com)
It now allows you to sign up for a digital subscription within the app, previously you had to purchase a subscription on their website to use the app. (goodereader.com)
That is why most men are more than happy to purchase a subscription in order to hook up with a girl sending them a message. (datingbusters.com)