How do I customize an email in shopify flow by putting customers first name

[ecoaidan]

Hi, What do I add in Shopify flow app to an email template if I want to include the customers first name inside of the email. This is what I'm doing right now, is it correct? 

{{ customer.first_name }}

Also, what if I don't have the customer name? Does it just not show up?

[paul_n]

Hi, don't try to guess variable name. There is a "Add a variable" link below fields that accept variables. Use that to find an insert the right variable (or at least see the exact name). Generally variables will not have underscores and are in camel case like firstName