Set and update existing user-defined fields for objects through API calls.
You can set values for these fields in the properties parameter where they are noted. If
you set or update a value for a non-existent UDF, an exception is thrown. These are
passed as name-value pairs, and multiple UDFs are separated by a pipe (|) character. For
example, to set values of two UDFs: TextUDF and IntegerUDF, with the
values testTextValue and 1005, you should pass the properties string
as:
TextUDF=testTextValue|IntegerUDF=1005