 Complete payment history showing: Payment Amount - Amount received Payment Method - How payment was received (PayPal, Stripe, Cash, Check, etc.) Payment Date - When payment was received Payment Reference - Reference number or notes Paid By - Which user/admin recorded the payment Features: Add manual payment entries Track partial and full payments Automatic entries from PayPal/Stripe payments Running balance calculation View complete payment history Save Invoice Button - Custom button that saves form via AJAX No post status selector (all invoices saved as "published" internally) Real status managed via custom post meta Saves all invoice data at once