Sprwt sends reminders automatically once a day. Each proposal has an Email Reminder Days field (its default comes from Catering > Settings > Proposals tab > Payments > Reminder Email Delivery Day). For proposals that are Signed and Approved or Partially Paid, a reminder goes out on the day that is reminder days before the Due Date, and again reminder days before the due date plus Net Days. The customer receives the payment reminder email with the remaining amount and a link to pay; your business email receives an admin copy and the proposal's team is notified. If the recorded payments already cover the total, the proposal is switched to Fully Paid instead of being reminded. There is no manual send reminder button on the Account Receivable Report.