REPP uses currently Basic Authentication (http://tools.ietf.org/html/rfc2617#section-2) with ssl certificate and key. Credentials and certificate are issued by EIS (in an exchange for desired API username, CSR (where CN must match username) and IP).
Test API endpoint: TBA
Production API endpoint: TBA
Main communication specification through Restful EPP (REPP):
Contact related functions
Domain related functions
Account related functions