At this time, it isn't possible for a customer to purchase multiples of the same product during a single checkout process.
Note:
If a customer attempts to purchase a one-time or multiple payment product that they have already purchased using the same account email, they will see a pop-up notification for the repeat purchase. They can dismiss the notification and proceed with the purchase if desired. If a customer attempts to repurchase an active recurring subscription, the customer will be redirected to their Library.
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