How can I automatically update supplier stock levels on my site?

[MrsSlocombe]

I want to be able to link to one of my suppliers API, so that their stock levels are showing on my site. 

I don't need to process orders through this, I can do that seperately. 

I simply want the stock to show what is available and for customers to be able to purchase from me rather than manually trying to keep checking what stock my supplier has in sizes, colours and updating it everyday or risk oversell.

Does anyone know of an app for this that would be suitable?

TIA