Complete processing rules for various types of online transactions are detailed in TransUnion TU4.0 and TU4.1 User Guides. The latest User Guides are available in this site’s Document Repository.
These documents provide the following information:
- Rules for constructing your TU4.0 or TU4.1 fixed format inquiry
- How to submit a request for single / individual subjects
- How to submit a request for multiple subjects
- Response to a unsuccessful request
- How a no-hit (no subject found) response is returned