Auto-generate PDF's via API Call

Hi - i am trying to figure out how to generate PDF's on demand via an API call. I build a template and then populate it based on content I have generated with the users content. I would like to stay in the Adobe stack. Can i do it? What products do i need? I could do it in Webmerge or PDFGenerator (comments please) but would like to leverage DC and the design stack in Adobe. Can't see any info on this anywhere. Any pointers please?