After checking If a integration sync id does not exists. Add a company and be able to add the the integration sync id to the company
something like
{"name":"Test Company","nickname":"Test Company","addressline1":"Address Line 1","addressline2":"Address Line 2","city":"City","state":"QLD","zip":"4129","countryname":"Australia","phonenumber":"1300603404","website":"databoxsolutions.com.au","notes":"Notes",
"integrations":{"integratorid":1,"syncid":21322}}