title: Paypal subscriptions - do not pay again (as long as the subscription is valid)
body: <p>I set a button on my website. After payment, the user goes to the online game and plays. What should I do if the same user visits the site again the next day and wants to play the game again, will he need to pay again?</p>
  <p><strong>How to make sure that a user who has already paid once (while his subscription is valid) does not pay again?</strong></p>
  <p>if you know where to look at the solution or where to download/buy a ready-made example, I will be very grateful to you!</p>
  <p><strong>I can't understand how to set it up, if the client is already my subscriber so that money will not be debited from him again? (until the subscription ends)</strong></p>