This integration was added in v1.4, check out the full release notes for this version here v1.4, v1.4HF1 - July 2019.
Prerequisites
In order to connect ResourceXpress to your EMS scheduling software the following will be required:
EMS Platform Services API version 44.1.19000.180 or higher. To check your version navigate to your Platform Services status URL e.g. http(s)://<servername>/EmsPlatform/status
An EMS Platform Services Integration Account, see this section for the account requirements
Access to the EMS Desktop Client and SQL database