Create a new product using the PHP SKD

Hello, looking at REST API it looks like there’s a call for adding a new product. I’m currently using the PHP SDK but it doesn’t seems like it has a call for adding a new product.
For example, for adding a contact I do something like:
$infusionsoft->contacts()->create($data)
I can’t find anything similar for adding a product, even by looking and the ProductService class itself.
Thanks for your help!