Hi
https://docs.mendix.com/developerportal/deploy/certificates
1.1 Incoming Connections
To connect to your Mendix Cloud application from the internet, Mendix provides a .mendixcloud.com or .mxapps.io domain. The certificate for this is managed by Mendix. If you want to set up your own domain name for a licensed app, you can configure custom domains. This is not available for Free Apps.
In addition, you can restrict incoming traffic by requiring client certificates signed by a Certificate Authority of your choice. For more details on how to set this up, see How to Restrict Access for Incoming Requests.
1.2 Outgoing Connections
You may need to use certificates to set up connections from your Mendix Cloud application to third-parties that require SSL/TLS. There are two possible scenarios for this: