Automated emails to ACTIVE recurring customers

Hi!

I'm trying to figure out the best way to send automated messages to active recurring customers.

I will be selling one product, either as a single purchase product or as a subscription. Within Squarespace I have created two products as it seems the only way to give customer the choice between a subscription or a single purchase.

I want to send automated e-mails to customers who are on active recurring plans (so not to people who cancelled already). Does anyone have any tips on how to do this?

With the Squarespace automations, it is possible to send e-mails to people who have purchased the subscription (as I just created 2 different products), however, I wouldn't be able to filter out people who have already cancelled. Or any tips on other platforms that could do the same? I have been looking at Mailchimp, but I wouldn't know how to create an active subscriber field...

Thanks!