# Authentication

- [PAAY](/crm/plugins/authentication/paay.md): At PAAY, It's simple. We increase payment authorizations, reduce unnecessary chargebacks and seamlessly monitor for fraud.
- [Authenticating with PAAY 3DS on Landers](/crm/plugins/authentication/paay/authenticating-with-paay-3ds-on-landers.md)
- [PAAY 3RI](/crm/plugins/authentication/paay-3ri.md): Version 2.2 of 3D Secure (3DS) introduced Requestor-Initiated (3RI) authentications, also known as merchant-initiated authentications.