Is there a way to invoke CPQ rest and soap services without using usename and password through an ex

Summary:

Content (please ensure you mask any confidential information):

Hello,

Is there a way to invoke CPQ rest and soap services without using usename and password through an external service?

Thank you,

Silvia

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):