If you are writing or looking for a specific blog post, let me know:
CMS platforms often use variations of this term (e.g., register_email syntax in Tiki Wiki templates) to handle user login fields when the email itself serves as the username. Why This Matters in a Blog Post Register_Email
Services like Azure Data Share use register_email operations to verify tenant/email combinations for secure data exchanges. If you are writing or looking for a
Showing how to "plug in" new functionality to existing platforms like WordPress/WooCommerce. Register_Email
Are you interested in a specific (Ruby, PHP, Python)? Is this for a specific platform like WooCommerce or Azure? The Case for Service Objects - Camertron's Blog
Proper handling of user input during registration to avoid vulnerabilities like privilege escalation.