Podbean recommends that podcasters consider using Podbean crowdfunding to secure support from listeners.

You can add a Paypal donate button by configuring a text sidebar widget in Podbean with the Paypal button embed code:

1. Follow Paypal’s instructions to create a donation button customized to your needs: https://www.paypal.com/us/brc/article/how-to-add-a-donate-button 
and copy the resulting embed code.

2. Follow the instructions to add/configure a Podbean text sidebar widget: https://help.podbean.com/support/solutions/articles/25000005078-adding-a-new-widget-to-my-podbean-sidebar  and input your Paypal donation embed code.