PayPal will suggest that you make an account with them, but there is no need to do so. You can select use credit/debit instead and make a one time donation. There is also a way to setup automatic monthly donations if that is convenient. Stripe made it easier to process the donation, but as a result that made it easier to run stolen cards repeatedly on our site until one goes through, charging us a fee when we accept it and when we reverse it.
We still pay a fee using PayPal, if you use credit or debit. However, the fee is reduced since we are a non profit organization.
No matter what, you entire contribution is tax-deductible. You will receive a receipt via your email.