I’m just wondering if anyone has had any experience interfacing to a web based form design and data collection application?

We want clients to be able to design their own online forms, e.g. an employee leave application form, or a safety inspection checklist etc. We need to be able to prefill some of this information, e.g. employee details etc, and we need to capture this information as a pdf when the form is completed.

Has anyone integrated with an application like this?