I'm doing some Apple iTunes Connect reporting via the Autoingest tool. It requires that I not only specify login account info, but also a "vendorid". I have no clue what our vendor ID might be. Where can I find such info on Apple's site?
Click on the Sales and Trends section, and your vendor ID will be displayed in the upper-left corner next to your developer name. It should start with an 8.
(Source: discussions.apple.com thread)
This number may be a bit harder to find since Apple re-designed iTunes Connect on Mon, Feb 17th, 2014.
Multiple vendors: If you go into the monthly financial section and have multiple vendors a drop down will show up in the upper left with this number.
If you only have one vendor: Download a monthly financial report. The vendor id is the long number at the beginning of the report name before the first underscore.