What fields are required when sending data to Faraday

Faraday matches your customers into our database at the individual level so we need to get as much information about those individuals as possible!
Date fields are extremely important when building predictive models, for example we like to know if someone is a customer but more importantly we need to know when they become a customer or when they purchased a certain product or took a certain action!
We prefer to have access to Orders tables

Required

Best and most complete possible identifying information on every line (first name, last name, full name, email, phone, address, city, state, postcode)
Relevant dates in ISO 8601 YYYY-MM-DD
Statuses, product names, etc. in plain text not numeric codes
CSV format
Comma delimited
Headers included
UTF-8 encoded
One CSV per compressed file

Optional but recommended

Do you have a data dictionary or definition of the fields that are being sent over?
How many customers do you have?
How do we know when someone has become a customer?
How many leads do you have?
How is a lead defined?
Do you maintain a mailing & billing address for your customers?
During the sales process are you capturing physical address, email and/or phone number?
Are there any geographic patterns we should see in your data?
Do you only sell in certain locations?
What is your most popular product? Least popular?
What % of your customers have purchased your most popular product?
What defines churn?
Date field for churning?
Discount codes?
Any codes we should exclude or be aware of?
Any 3rd party data that has been licensed?
Where is engagement data (email) stored?
Do you maintain a record per email sent?
Do you have the date of the email was sent?
Do you track engagement by emails na recipient (ie. clicks opens)
Do you have the date of a given engagement?
Has there been a drastic change in your marketing strategy or business overall in the last quarter? 6mo? Year? Etc?