ZeroBounce.Net stores all your invoices in your account. Use the menu on the left hand side and click the "Invoices" link under "Account Info". If you're already logged into your account, simply click this link: My Invoices
The invoice ZeroBounce.net provides in your account is for your convenience and there can be missing information needed for tax related expenses and account purposes, which is not provided to us by PayPal.
ZeroBounce.net only has access to the information that PayPal provides us on your order, which can be very limited. PayPal protects their customers' data and doesn't transmit information that is not needed for the vendor to complete your order. PayPal will also send you a receipt after the payment. The receipts should be kept for your records, as they contain your full information.