To use the feature, you’ll need to be on the latest version of the Skype mobile app. Then, you’ll select “Find” on the top bar while in conversation with a friend or family member, and choose the “Send Money” add-in. You just type in the amount to send, confirm the payment, and hit send to complete the transaction. To be clear, the feature is designed for sending money between friends and family – not payments for goods or services from a business. And like PayPal’s peer-to-peer payments on other platforms, the rates are the same. That is, sending is free when you use your PayPal balance or debit card in the U.S. If you choose to use a credit card instead, the fee is 3.4 percent of the transaction amount plus $0.30.

https://techcrunch.com/2017/08/02/you-can-now-use-paypal-through-skypes-mobile-app/