Choosing the Right Identifier:

Each identifier option has specific use cases:
Email Address (Recommended)
- Pros: Usually unique, rarely changes
- Best for: B2C businesses, online stores
- When to use: Most general cases
Customer Number
- Pros: Completely unique, systematic
- Best for: B2B businesses
- When to use: When you have an existing customer numbering system
Phone Number
- Pros: Generally unique
- Best for: Local businesses
- When to use: When phone is your primary contact method
Customer Name
- Pros: Easy to recognize
- Cons: May not be unique
- When to use: Only for small businesses with few customers