Hi Andy,
No, I am afraid I do not have any sample process documents on that, as well as the fact that I worked on this topic a long time ago:)
However, i recall building a Z program which would clear AR open items (also pledging factor as indicator subject to Factoring) and transfer to a specific Factoring customer via BAPI at the same time extracting its BSID AR open items information to the required format for the factor company to be interfaced. All are not SAP standard but tailored to the specification given by them.
Kind regards
Taro