Add conditional custom messages?

I have an extremely simple sign up form that employees use to get people to sign-up with they come in and visit a physical retail store. NOT AN ONLINE STORE.

When people sign-up, they receive a “free spin” to get discounts and other promotional stuff if they buy something in the store that day.

There are only 2 fields: email and phone number (and only the email is required); however, we need to display 3 possible messages.

1. If it’s their first time ever, they have to at least enter their email. In which case, we display the “Success: single opt-in” message.
2. When they come back the next time, we want to check the phone number field in MailChimp.

• If the phone number field is empty in MC, ask them to please sign-up again with a phone number this time.
• If the phone number field has something in it, ask them to please leave a google review.

First, does that make sense? And second, is that possible with some functions, hooks, or filters you’ve already created? (with examples?)

Thank you!

• This topic was modified 4 years, 10 months ago by sandeld.