What is the best way to consume a SOAP WebService from C4C in HCP?

Hi HCP-Experts,

I would like to consume a SOAP-WebService for TargetGroups and Accounts from a C4C-Tenant in a HCP-application, but I don't have experience in that area.

What is the best way to do this? I see three possibilities right now:

1. Consuming the WebService directly in JavaScript (this would show up which technical user and pw is used for the connection, if someone looks into the js-coding of the web App?! -> no real option)

2. Consuming the WebService in serverside Javascript -> call the script in client-side Javascript to get the data

3. Consuming the WebService in a Java Servlet -> call the servlet in client-side Javascript to get the data

Thanks for your help and best regards

Tom