Перевод - Итальянский-Английский - Come da accordi intercorsi le ho inviato quanto...

This translation was no meaning only
"come da accordi intercorsi" has not been translated.
It may look pleonastic and burocratic, but it is so in Italian too.
It means "As previously agreed, I sent you the fixed (or maybe settled?, just so as not to repaeat agreed) amount....
On the contrary, the second sentence begins with a non-burocratic "ora" = now (herewith seems too formal).

Mmm... you´re right.