Retrieve the Open311 GeoReport v2 service definition (required attributes) for a service code before submitting a request

Steps

1. Call GET /services.[format] to list available service_code values and check the metadata flag on the target service
2. If metadata is true, call GET /services/{service_code}.[format] to retrieve the service definition's attribute list
3. For each returned attribute, check the required flag and datatype (string, number, datetime, text, singlevaluelist, or multivaluelist)
4. For singlevaluelist/multivaluelist attributes, read the nested values array of key/name pairs to present valid options to the user
5. Build the attribute[code]=value pairs for the POST /requests call using the codes and, for multivaluelist fields, repeat attribute[code][]=value for each selected value