Online subscription

A year back I purchased an annual subscription for a science magazine, on the web. Initially I read the online magazine but soon I lost interest and almost forgot about it till I got a debit on my credit card.

The magazine company did not alert me or seek my permission to renew the subscription. The company simply billed me the annual renewal charges. Later on I did cancel the subscription and got the credit reversal, after spending few minutes on the web.

How was I tricked?

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