The internal name of a Vendor Certification can be found in the Data Aggregator Data source UI
Data Aggregator
To find the internal name of any Vendor Certification:
1) In NetOps Portal navigate to:
Administration
->Data Sources
-->Data Aggregator
--->Monitoring configuration
---->Vendor Certifications
2) Mouse over the column headers under the Vendor Certification list.
Click the Gear that appears->Columns->Internal Name
3) Find the Vendor Certification in question and note the internal name.