Our current PayPal installation requires cookies, and browsers like Brave, or extensions like Duck Duck Go that don't support cookies, may cause payment issues.
If you can use another browser for payments that is an easy workaround. Or, we can email you an invoice that you can pay via credit or debit card. If that is preferable just reach out to us.
If you have further questions, or need further assistance don't hesitate to reach out to our team at firstname.lastname@example.org.