Can we use consumable currency/coupan to buy a calendar?

In our app we create calendars dynanamically.And other users using our app can subscribe to them.If a user wants to subscribe to a calendar,first he need to buy a currency/coupan.If he wants to subscribe to 5 calendars then he needs to buy 5 currencies.Is it allowed to do this way?

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You used the word 'subscribe'. A consumable purchase is good until used or 'consumed'. A subscription is good for a certain time period but during that time period it can be used over and over again. It sounds like you are selling consumable tokens that are good forever until used (consumed) to exchange for a calendar. That means the calendar must remain available forever - albeit, it will become last year's calendar.