Function fill_access_key_transaction 

pub(crate) async fn fill_access_key_transaction<P>(
    provider: &P,
    tx: &mut <TempoNetwork as Network>::TransactionRequest,
    access_key: &TempoAccessKeyConfig,
    chain: Chain,
) -> Result<()>
where
    P: Provider<TempoNetwork>,

Fills a Tempo transaction request that was built outside crate::tx::CastTxBuilder before access-key signing.