We need the ability to use API to to bring in calendar events from other systems, EMRs. The new services features in calendars gives us the ability to start using the native HL calendar system as a true medical clinic EMR but we would need to be able to bring in all historical calendar events from other systems. Additionally, for those who would like to continue to use their EMR but would like the appointments synced to HL for workflows having APIs to handle this is necessary. If this already exisits, PLEASE show me the documentaiton.