Overview
Building an EPP client can seem complex given the large number of commands and variations. A phased approach makes it manageable.
Phase 1: Domain Check
Start with just the domain:check command. This gets you familiar with TLS connection, login/logout, and basic EPP request/response handling. The check command is simple and low-risk.
Phase 2: The Golden Path
Implement the core registration flow in this order: (1) Create a contact object (contact:create), (2) Create a host object (host:create), (3) Create a domain (domain:create). This sequence covers the fundamental operations your customers need.
Phase 3: Expand as Needed
Once the golden path works, build out additional commands based on your business requirements: domain renewal, transfer, deletion, restoration, status code management, message queue polling, and premium domain handling.
Use Existing Libraries
EPP has been around for a long time and has mature open-source client libraries in multiple languages. Search for a popular, well-maintained EPP library in your programming language rather than building the protocol layer from scratch. CentralNic also provides a PHP EPP library.
Use OT&E for Development
Do all development and testing in the OT&E environment: epp.ote.registry.co, port 700. OT&E is not IP-restricted and uses a separate database — no risk of affecting live domains.
XML Schema Validation
The EPP system validates all request frames against XSD schemas. Use the EPP Frame Validator in the Registrar Console to test your XML frames before deployment. Invalid frames receive an error response immediately.
Related Articles
- Using the OT&E Environment to Test Your Integration
- EPP Commands Reference
- How to Configure EPP Access