REST API for filling the Sales Order form/page

Summary:

Looking for API which can fill out form/pages for Sales order creation

Content (required):

Hi,

Please let us know whether we have APIs which can be used to fill out a page/form for creating a Sales ORder and take actions the way a user will manually take. For example , user logs in application, Navigates to Sales order section, creates a Sales Order, Saves record, takes some action by clicking button etc. which sends information to external system etc. In other words, we want to simulate user actions the way RPA does but using APIs on which we will have control.