When having BizzStream perform a REST call through an SSL service, than you're required to call the SSL Certification Path.
Most public certificate authorities use their most important certificate, known as root certificate, to sign their intermediate certificates. This is done so that the intermediate certificates can be used offline, while containing a low security risk level. These intermediate certificates are then used to sign the final certificates that are published.
The type of SSL certificate does not matter for BizzStream. The only difference between the different types of SSL certificates (Domain SSL, Organization SSL, Extended SSL) is the verification process. The verification process for Domain SSL is very light. Organization SSL and Extended SSL have a more thorough verification process.
BizzStream however only trusts the root certificates. In order to establish a safe certificate, the whole path of certification has to be included in the call.