xero invoice creation through breadwinner app

Hi All,
Need a help with integrating xero invoice through Breadwinner app.I have installed the breadwinner app .i want to synch a custom object records to xero incoice.when a record is created it will synch to zero invoice using breadwinner app.Any help or any document that i can go through.
Any help would be appriciated.

Thanks Manohar