Do I Need an SSL/TLS Certificate to Use MemberPress?
No, we do not require any of our users to use a security certificate, though it is recommended.
Security certificates are what web browsers look for to place the green lock icon on the left of your site URL.
Seeing that may help your customers feel more confident in entering their confidential data into your site.
For the exact SSL/TLS security requirements of those gateways, please contact their support directly.