Hi annbrinck,
Secure invoicing is an upgrade for all MYOB merchants who do not yet have the online payment service on their software. This service will add more options for you to get paid, including payment via Credit Card, E-Wallets, and BPay. We understand if some merchants do not want to use the online payment service; that's why we made our settings flexible, allowing you to disable the service once verification is completed.
However, if you choose not to upgrade, the feature for emailing invoices from the software will be stopped. This means you will be unable to send invoices directly from the software. Nevertheless, you can still download the PDF copy of the invoice and send it using Outlook, Gmail, or any other email tool you use.
Please check this link to learn more about the upgrade: Secure invoicing upgrade
Please check this link to understand why we are asking for these documents: Online invoice payments explained
I hope this helps!
Regards,
Earl