Can I use the renderPDFForm Service to convert the xfa form to PDF without render it to workspace?
I tried to use it to convert the form to PDF but not sure what should I input for the URL Options?
Can I include attachments in the PDF as well?
Yes, renderPDFForm (part of the Forms Service) is for merging data and template and getting a PDF. With the 8.2 version the URL settings are used to point to the template location. It uses a URI format - i.e if the template was in your myForms folder in the repository your settings would be:
Form to Render: /myForms/mytemplate.xdp
Content Root URI: repository://