This is the Xero Payroll API for orgs in Australia region.
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://api.xero.com/payroll.xro/1.0/PayRuns
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://api.xero.com/payroll.xro/1.0/PayItems
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ https://api.xero.com/payroll.xro/1.0/Settings