A Shopify integration/automation question

Hi everyone. I have a Shopify integration/automation question. I've set up a newsletter signup form that offers 10% off the first order once the customer has signed up. The automation process then sends them the coupon code. I then also want to send a couple of further reminders about using the coupon code. My question is: is there a way MailerLite can find out from Shopify whether a customer has used their coupon code (or placed an order), that I can then use as a condition in the automation? I don't really want to send someone a reminder to use their code if, in fact, they've already used it. Can anyone help? Is there a solution to this?