Here is where you can find documentation on ESP VAERS.
Technical Guide to Implement ESP VAERS
Clinical Guide For Practice Managers and Clinicians including FAQ
ESP VAERS slide deck for conferences and presentations
ESP VAERS short slide deck for clinical sites
VAERS 2.0 HL7 2.3.1 Messaging Update Documentation
ESP VAERS 2 MDM_T02 specification
Vaccine Adverse Event Reporting System home page