add
Adds an alphanumeric plain-text parameter.
General format
void add ( paramName, paramValue )
Syntax rules
1. paramName is an alphanumeric data item that specifies the parameter name.
2. paramValue is an alphanumeric data item that specifies the parameter value.
Example
To define parameters:
77 city-zipCode pic x(7value "26456".
...
  set params = http-param:>new()
                         :>add("get_Zip_Code", city-zipCode).