Updating document fonts programmatically

[br1h]

Hi, I have a batch of PDF documents (~1500) for which I need to update various things, such as, the font style, font color and watermark. Is there a way of doing this using any of adobe's APIs? 

[rawvarun]

https://developer.adobe.com/document-services/apis/pdf-services/  explains how to update PDFs using API.