{"to":"uat+1772700747@example.com","subject":"Friendly reminder: Invoice #2 is partially paid (50/199.99)","body":"Hi,\n\nThis is a reminder that invoice #2 for $199.99 due on 2026-03-20 is currently marked as partially paid (50/199.99).\nWe have received $50.00 so far. Remaining balance: $149.99.\n\nThank you!"}