Due to planned change with the root certificate from our CA (Let's Encrypt) older clients making requests to the Flybuy system may receive errors. If you see errors related to certificate authenticity or establishing secure connections please contact your customer success representative or Radius Networks Support support@radiusnetworks.com.

For more information on Let's Encrypt's certificate changes, their expiration, and actions needed, see details from Let's Encrypt:

• https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/

• https://letsencrypt.org/2020/12/21/extending-android-compatibility.html

• https://community.letsencrypt.org/t/production-chain-changes/150739

• https://community.letsencrypt.org/t/openssl-client-compatibility-changes-for-let-s-encrypt-certificates/143816