Connect file scan protection to my site

I am looking into implementing a virus scanner into a web application I am creating that allows the user to upload files. All the background functionality is completed, however I am wary that a malicious user may upload a virus and other users download that file.

I have been researching for a few months now on how to implement a scanner into my web application.

I have located various online virus scanners such as MetaScan-Online and VirusTotal.

I have read into the documentation that they have provided, however I am still confused and am unsure if I can implement these applications into my applications using the API.

Can I?

And if so, is there another virus scanner that enables a whole folder of files to be scanned simultaneously?