The contacts list forces email to be populated. We have many customers for whom we only have their phone number. Right now, we have a dummy placeholder for email for those customers, but we would like to make it optional or use another column as a unique ID.
Hello Maxwell,
Thank you for reaching out. I wanted to clarify that the unique identifiers for contacts can either be their email address or mobile number. If you're looking to create contacts using their phone numbers, you can utilize the "mobile" property for this purpose.
If you have any further questions or need assistance, feel free to ask. 
Perfect, thank you!
