Can Breadwinner share the Public URL of the Invoice?
Xero has a great feature that lets users get the Public URL of an Invoice if they are logged in. To see the public URL in Xero, click the arrow next to Invoice Options (on the upper right of an Invoice page), then "Share Invoice". Xero will generate a public URL.

At Breadwinner, we would love to provide you with the Share Invoice / Public Invoice URL.
However, Breadwinner communicates with Xero via Xero's API, and there is currently no functional way for us to obtain this public URL.
If you need this feature, you can help by voting in Xero's feature request forum and adding your voice to the other Xero users who need it. You can vote using the link below:
Once Xero enables this feature (it could be years, as it's been 3 years already since I posted this feature request), we will happily build this feature into Breadwinner.