Please be sure you’ve read the docs and API specs before asking for help. Also, please be sure you’ve searched the forum for your answer before you create a new topic.
Please consider addressing the following when creating your topic:
What have you tried? Creating a test source for web service.
What errors did you face (share screenshots)? Aggregation option only available for HTTP Operation which does not exist in the target system.
Share the details of your efforts (code / search query, workflow json etc.)?
What is the result you are getting and what were you expecting? Is it possible to load existing accounts using API or CSV for a system that does nos provide a WS for account aggregation?
You’ll need an API that provides the users to do an aggregation using the WebService Connector. Do you have one that works with Postman/Bruno for looking at the users from an API?
If the application an Internally developed application, or is it a commercially available one, such as Zoom, AD, GitLab, etc? If it is a commercially available one, then it is likely to have an API end point or endpoints that you can use to get the data from. If you can let us know the application, we could likely help point you to the documentation for an endpoint to try.
If it is an internally developed application, can you talk with the team that developed it to add an endpoint for this purpose.
If you need to use a CSV, then what @vishal_kejriwal1 said is correct, and you should look at the delimited file connector to get the data in. This would not be connected to the endpoint for provisioning though.
There could be some more complex options (workflow for create on the Delimited file, etc) once we have a better picture of what you are working with