Applying Tag when form changes to Paid

I might be missing it - or it might be in an automation that I can't seem to find. I'm running pro versions of FluentForms and FluentCRM. I'm accepting registrations via form and they have to send payment by etransfer. I can create email notifications that sends when the form is marked as paid. What I'm trying to also do is apply a tag based on that same situation. I can only seem to find the way to apply a tag upon submission of the form and not when the payment status changes like the email notification. I can't use FluentCart in this situation as I'm also gathering other information that I can't currently gather via FluentCart.