  pub fn liquidate(
    ctx: Context<Liquidate>,
    position_size: u64,
+	bump: u64
	) -> Result<()> {
		...
		require!(pda == ctx.accounts.position_account.key() ,
			FlashFillError::AddressMismatch
    	);
		let seeds = &[
		    b"position", 
		    trader_key.as_ref(), 
		    trading_pool_key.as_ref(),
		    random_account_as_id_key.as_ref(),
		    &[bump_seed]
		];
+		require!(bump_seed == bump, FlashFillError::AddressMismatch);
