Typically, a recurring payment through PayPal is processed using a PayPal subscription and recurring payments, which takes care to automatically publish your customers on a periodic basis, without requiring any action from the client.
However, the only way to change the price of a recurring payment after it has already begun is to create a “change button” that requires interaction with the client and is not very suitable for your scenario (see this thread ). You can also ask your question in the Paypal developer community forums.
Good luck
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