Will this allow me to get the site information using the value in KPIN e.g. 7702?

where does the customField id come from? the custom Feild of interest in this case is called "KPIN" i can get some info containing the customField id using the following but cannot seem to use ?CustomFields.CustomField.ID=KPIN https://<company>.simprosuite.com/api/v1.0/companies/",0,&...

I am having a similar problem getting the API to access sites-details-primary contact Some info is retrieved using: https://{company}.simprosuite.com/api/v1.0/companies/0/sites/274?columns=Name,ID But i also need Name Email and mobile phone number. Can you please provide an example? Also is there a ...