Crypto is only available as a payment option if the individual has enough crypto in their account to pay in full (they can’t pay part in crypto and part with another method of payment).
PayPal will convert the crypto amount from the individual’s account into USD, the individual will play a small transaction fee and the business receiving the funds will incur no additional fees.*
(*PayPal Balance account required. When you buy or sell cryptocurrency, including when you check out with crypto, PayPal will disclose an exchange rate and any fees the payer will be charged for that transaction. The exchange rate includes a spread that PayPal earns on each purchase and sale.)
Read more about PayPal fees:
https://www.paypal.com/us/webapps/mpp/ua/cryptocurrencies-tnc?locale.x=en_US#fees-pricing
Cryptocurrencies cannot be mixed with others when making a purchase.
PayPal’s fraud, return, and shipping protection applies to payments using crypto.