Apex class warning error
Starting with Salesforce Winter ’19, Genesys Cloud for Salesforce users may see warning messages indicating that they do not have access to an Apex class.
Users of current Salesforce organizations can proceed without any issue. Users of new Salesforce organizations must be granted permission for each Apex class. For more information, see Apex Class access for Open CTI in the Salesforce documentation and Administrator requirements for the Genesys Cloud embedded clients.
For more information about the integration, see About Genesys Cloud for Salesforce.