I didn't know that it was a subscription that I would have to end.
I thought it was a one time only charge that I could go back on the website and manually charge again to get another six months.

And I'm just wondering if I'm able to get my money back.

Right now I'm looking at your profile and it's not showing that you are a donator or an anime supporter. If you paid for either the soundtrack or the anime subscriptions, then the only way to keep from being billed again is through your paypal account and cancel the subscription.

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I can refund you for the last payment, but only if your account shows absolute zero use, and I'm only doing this based on good will. I mean, these are donations, so I'm not going to keep anyone's money against their will, but I can't go around giving refunds to everyone whenever they feel like getting one. So email me your email address used for paypal and your full name and I'll sort it out for you.

Also, the fact that this is a subscription is outlined everywhere. On the page where you pay, the item you are buying is called a "subscription", the amount you are paying is called "$19.99 every 6 months", and when you do pay, you get an email saying "Your subscription has been created". Frankly, I don't see how it can get any more clearer.