pub trait GatewayFederationApi {
// Required method
fn outgoing_contract_expiration<'life0, 'life1, 'async_trait>(
&'life0 self,
contract_id: &'life1 ContractId,
) -> Pin<Box<dyn Future<Output = FederationResult<Option<u64>>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait;
}