 trigger first If Stop After (Days) is 30 and interval is 3, maximum sends = (30 / 3) = 10 emails before day limit Check if invoice was marked as paid, which cancels the mission Check Portal > Scheduled Emails mission status - should show \"Completed\" when stopped by limit If status is \"Cancelled\", invoice may have been marked paid or mission terminated Problem: Placeholder (e.g., {days_overdue}) shows literally in email Verify placeholder spelling matches exactly (case-sensitive) Check that curly braces { } are used (not parentheses or brackets) Ensure invoice has required meta (customer name, email, amount, due date) For {days_overdue}, verify invoice due date is in the past (invoice must be overdue) Check reference guide in settings for current available placeholders Problem: