If you want to call an Integration Server service from an angular application then I would create a REST descriptor for the service to expose this as a REST endpoint, then consume this REST endpoint in the angular application.
Angular structure/code/examples differ across versions (it’s one thing which frustrates me about angular). If you search the web you can probably quickly find an example based on the version of angular you’re using, but here’s a starting point from the angular docs: Angular - Communicating with backend services using HTTP
If the Integration Server endpoint is being called from the front-end (browser) and the IS/Angular server have different addresses, then you may need to consider CORS, or proxying the request from the server hosting the angular app to the integration server. You should also think about securing the REST endpoint to reduce attack vectors from malicious actors, whether that be via an API Gateway, or other security configuration and appliances.
#webMethods#Flow-and-Java-services#Integration-Server-and-ESB