Hi
If you purchase anything using a credit card and check your account online you will see pre authorisation until the purchase is finalised. If it is a purchase made in person at, for example, a retail store, then it is usually finalised in a day or so and the store name will then show, if it is something you purchase online then the pre authorisation can show for a bit longer, usually until they send your order. In this case the pre authorisation would stay until you decided whether to cancel or take out a subscription.
Andy