What is the process for adding guests email address at the point of sale?

[kmbarnes55]

We are planning to request customer emails at the POS to ensure accuracy and opt-in. How do we accomplish this at the time of purchase?

[alexandriak]

In your square app you can go to customers,  and add new customers that way. You could do this prior to the sale or after the sale. 

I know there use to be a way to attach a customer to a sale either before or after completing it but I'm not in front of my register at the moment to see if that is still an option.