@type t() ::
  %Procore.Model.RestV10ProjectsProjectIdContractsContractIdInvoiceConfigurationGet200ResponseRetainageRuleSetRetainageRulesInner{
    id: integer() | nil,
    max_retainage: String.t() | nil,
    position: integer() | nil,
    retainage_percentage: String.t() | nil,
    rule_type: String.t() | nil,
    rule_type_upper_limit: String.t() | nil
  }