Create donation interface for a charity's website (WordPress) -- 2

I want to create a clean, professional, and secure donations page for the organization Foundational Research Institute ( [login to view URL] ). I'd like the donation page to look similar to [login to view URL] or [login to view URL] or donation pages of other major charities. It should include options to securely donate by credit card, PayPal, and bitcoin (and possibly other options you might want to add). Our website is built using WordPress, so you should know how to navigate that. Maybe there's a WordPress plugin to make this process easier? (But tell me if you plan to use a non-free plugin.) Let me know if you have questions. Thanks!