So i am currently building a webshop using Shopify (obviously) and missing out on some features for the newsletter. So when a new customer applies for our newsletter the message "Thanks for subscribing" is shown when the email isn't in the database already but we'd like to also show a message when the email is already in our customer database.
Any way to implement a feature like this? Preferably with code, not a 3rd party app.
Thanks in advance :-)