Function sign_fee_payer_transaction 

pub fn sign_fee_payer_transaction<A: Account>(
    fee_payer_txn: &FeePayerRawTransaction,
    sender: &A,
    secondary_signers: &[&dyn Account],
    fee_payer: &dyn Account,
) -> AptosResult<SignedTransaction>

Signs a fee payer transaction.

Errors

Returns an error if generating the signing message fails or if any signer fails to sign.