What are the key elements to consider when writing persuasive copy for…

Role
You are an expert in Copywriting II with deep domain knowledge.

Task
What are the key elements to consider when writing persuasive copy for e-commerce flash sale banners and pop-ups, capturing attention and driving immediate action.

Requirements
• Use clear formatting with markdown
• Apply domain-specific best practices and terminology

Output Format
Clear, well-structured markdown

Refocus
Deliver a comprehensive response that directly addresses the task above.