It depends on what do you want to import or integrate. Peoplesoft is another huge enterprise application with various modules, you have to be clear on what are you trying to achieve with this integration. It is possible that someone on the community might have performed a similar integration and can provide pointers however these kind of requirements need a well defined planning and approach where professional services or partners can help. I recommend again to spend some more time to review the docs which I sent in my previous post, those will answer most of your doubts. Like this List of Available Integrations - ServiceNow Wiki link I found in the same wiki docs.
