Customer Action: Customer views unpaid invoice and clicks "Pay Now" PayPal Redirect: Customer is redirected to PayPal checkout page Payment Selection: Customer selects payment method (PayPal account or card) Authorization: Customer approves payment on PayPal Return to Invoice: Customer returns to Agency Pulse Invoice IPN Notification: PayPal sends instant payment notification (IPN) Payment Recorded: Invoice payment status updates automatically Email Confirmation: Customer receives payment confirmation email Admin Notification: Administrator receives payment notification (if configured)