I have been charged by apple services through PayPal and I don’t know what it is for

This is primarily a user-to-user support forum; other Apple users like you. We don't have access to information about charges to your account. Apple has a support article about charges — see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help. See: If you don't recognize a charge - Apple Support

or go to Subscriptions and Billing - Official Apple Support