Api that will allow me to register a vendor provider with the vcenter server 5.1

Hello

Is there any api that will allow me to register a vendor provider with the vcenter server 5.1?

In the vsphere client application, there is an Add button that allows  to add a vendor provider. I am looking for an api that will accept  provider name, url, login and password and register programmatically the  vendor provider with the vcenter server.

Thanks

elizabeth