You can accept donations with PayPal. To do so, add your PayPal business/merchant account email on your Donorbox Payment Processors page.
However, we highly recommend using Stripe as it provides a faster checkout process for donors who don't have a PayPal account. With PayPal, the donor will be redirected to paypal.com. Stripe allows the donor to enter his or her card number directly in your donation form. It's most optimal to use both Stripe and PayPal to provide your donors with as many payment options as possible.