According to PayPal's terms of use, a third party app (like Namastream) cannot change the price or cancel a subscription. 

Once a recurring payment is set up, the price cannot be altered.
And the only way the payment can be stopped is for the teacher or the student to login to their respective PayPal accounts and stop the subscription (or pre-approved payment).

The student must go into their PayPal account to stop or cancel a recurring payment.

  1. Log in to your PayPal account.
  2. Click Profile near the top of the page.
  3. Click Payment preferences.
  4. Click Update next to "My pre-approved payments".
  5. Select the merchant.
  6. Click Cancel, Cancel automatic billing or Cancel subscription and follow the instructions.




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