Inventory checking for Yamaha is now possible. The process of configuring it although is slightly complex.
The complexity arises because Yamaha require something known as a 'client side certificate' in order to access their site. C9 can handle this no worries, the only additional complexity from c9's point of view is you need to give c9 a Certificate file and the password for that file.
The real complexity although is getting the certificate file in the first place.
If Yamaha have provided it in an email, you can try and just add it into c9 as is and you might get lucky.
Otherwise you need to extract the certificate out of Internet Explorer. This process is complex. Read on for more details.