The Fields API describes a hierarchy of your data. At the heart of this API is the listing of FieldId values. Each FieldId corresponds to a value in the Entries API.
formIdentifier: - this will give you information about just one form. A request without the formIdentifier will return all forms.
showRequestURL: - use only for DEBUG purposes
debugConnection: - samilar as above. Either "0L" (false; default) or "1L"
domain: - for whatever reason domain's ccTLD may change. With this parameter you can change default wufoo.com to another one such as wufoo.eu
Returns
Title - The title is the friendly name you gave the field when creating your form. For example, if you were building a table with the API, the Title would be a column header.
Type - The Type represents a Wufoo field type. A listing of the these types can be found in the Field Type section of this documentation.
ID - This is the unique reference ID for your field. There will be one corresponding ID for each Entry in return value of the the Entries API.
IsRequired - This value can be one or zero, representing whether or not the field has been marked required in the Form Builder.
OtherField - This value is true or false and is only set if the field has choices. Only Multiple-Choice fields have the option of an Other field. When a Multiple-Choice field is marked as HasOtherField, the last choice is the Other field.