In STOREFRONT most data is accessed using either a Title, Provider ID (PID), Retailer ID (RID), or Vendor ID (VID).
Below you can find a descriptions for what each of these items are and how they are used:
Retailer ID:
This ID number will be tied to the specific retail instance your title is live on and can be found in the stores URL.
Provider ID:
Provider ID is studio specific and will pull up all records of your title across all retailers and territories.
Title:
You can also search for just the title of the series you wish to see results for. This functions almost exactly the same as using a provider ID.
Vendor ID:
Vendor ID is for iTunes only. For some studios Vendor ID and Provider ID may be interchangeable while for others it is a separate and unique identifier.