Can I connect one account with RPA?

No, it is not allowed as per our Terms of Use, article 1, No. (3)

Definitions 

A “Registered User” is a natural person who has set up an account to use the Service. (Natural persons who are affiliated with an Organizational Subscriber (e.g., employees) and have signed up to use the Service based on the Organizational Subscriber’s Company Plan are included in this definition of Registered Users.)

If you want a direct integration with your system, it can only be done by using an API integration option.