On a schedule the scenario pulls fresh contacts from Xero and pushes them into Okdesk customer lists. Retargeting always runs on a current base.
Automating Xero and Okdesk takes no code: a ready-made scenario does the routine for you.
You can launch this Xero + Okdesk integration in Scriptera: describe the task in plain words — the scenario is built, launched and monitored for you.