More advanced PayPal integrations can be achieved by using Add-on partner Zapier: https://zapier.com/zapbook/paypal/xero/3429/create-xero-invoice-from-paypal-sales/
We will continue to leave this request open though as a source of ideas for the Xero integration with PayPal.
An error occurred while saving the commentDavid commented
If you invoice for your service and get paid later, then you should be entering invoices at time of sale and matching the paypal receipt with the open invoice.
If you receive payment at time of sale, why would you need to enter a sales invoice? Surely a receive money is much simpler and practical - especially if you have a large volume of transactions.