Kindly: Payment Reminder Pro

We run multiple Shopify stores and take a lot of bank transfer and invoice orders, so chasing unpaid ones used to eat real time every week. Kindly handles that completely on autopilot now. You can build multi-step reminder schedules based on the due date, order receipt date, or invoice sent date, which means the timing actually matches how our payment terms work instead of forcing everything into one rigid flow. shopify
The flexibility is the standout. We set up separate reminder schedules per payment method and per order tag, so invoice customers and COD customers get treated differently. Unpaid orders auto-cancel after a set number of days, which frees up inventory without us touching anything, and the analytics dashboard shows recovered revenue, success rate, and deliverability so we can actually see what the app is bringing in. shopify + 2
Setup was quick, the email templates are easy to brand, and support has been responsive every time we had a question. If you deal with unpaid or draft orders, this pays for itself fast. Highly recommended.