Always enable Sandbox Mode first and thoroughly test all payment scenarios Create realistic test invoices and complete full payment flows Configure IPN BEFORE going live to ensure automatic payment confirmation Keep your WordPress debug logs enabled during initial setup Monitor your PayPal account daily during first week of live operation Set up email alerts in PayPal Settings for transaction notifications Document your PayPal configuration for team reference Test IPN delivery manually using PayPal's IPN Simulator before relying on live notifications Set up customer payment notification emails to build trust Review PayPal's account security settings regularly