Yes, when the other system's API fits the step. On qualifying IAM plans, such as IAM Professional and above, Docusign Workflow Builder has a Make a Web Request step, and Docusign installs the HTTP app the step needs. The step sends GET, POST or PUT requests to another system's API. The Docusign guide "
Configure a Make a Web Request Step" lists Basic Auth connections, and the Docusign overview, "
Connect to Any Service Using Web Requests", also lists OAuth 2.0 client credentials. If your system's API accepts one of those connections and each call is one of those requests, a workflow can call it. We check that on the scoping call. A custom build covers other sign-in methods and request types, and work that runs outside a workflow.