A list of PowerForms.
@type t() :: %DocuSign.Model.PowerFormsResponse{ endPosition: integer() | nil, nextUri: String.t() | nil, powerForms: [DocuSign.Model.PowerForm.t()] | nil, previousUri: String.t() | nil, resultSetSize: integer() | nil, startPosition: integer() | nil, totalSetSize: integer() | nil }