call API with Credentials in sap screen personas

[User_1443410]

I want to open a  api with given user id and password to extract the data  in sap screen personas(public cloud). The link is opened  by using session.utils.Openurl() . The JavaScript methods for api call  with credentials like btoa, fetch, ajax methods not working. pls share some idea for scripting.

SAP Screen Personas SAP S/4HANA Cloud Public Edition API Management 

[OwenLiu]

Added front end tag.

[User_1443410]

I want to open a api with given credentials and get the api data then store it to the container. Then validate the data in the container with screen data  in sap screen personas . I have no idea about this. I'm just a beginner in JavaScript. Pls guide me