@type t() ::
  %Procore.Model.RestV10ProjectsProjectIdContractsContractIdInvoiceConfigurationGet200ResponseRetainageRuleSet{
    contract_id: integer() | nil,
    id: integer() | nil,
    name: String.t() | nil,
    retainage_rules:
      [
        Procore.Model.RestV10ProjectsProjectIdContractsContractIdInvoiceConfigurationGet200ResponseRetainageRuleSetRetainageRulesInner.t()
      ]
      | nil
  }