openrtb.2.6.cattax

What it means

OpenRTB 2.6-202204 introduced bidrequest.cattax, site.cattax, app.cattax, publisher.cattax, content.cattax, producer.cattax, bid.cattax, which openRTB 2.6 standardized taxonomy selection with cattax across request and bid objects..

Why it matters

bidrequest.cattax is only defined from 2.6-202204 onward. Used against an earlier version it is not valid, and a consumer below 2.6-202204 treats it as an unknown field.

How to fix it

Target OpenRTB 2.6-202204 or later when you send bidrequest.cattax, and make sure the value matches the type and any enum the specification defines for it.

Paste your bid request into the tester and select OpenRTB 2.6-202204 to see whether this rule fires against your payload.

Reference

• Specification section: Sections 3.2.1, 3.2.13, 3.2.14, 3.2.15, 3.2.16, 3.2.17, 4.2.3
• Source: OpenRTB 2.6 Appendix B: Version 2.5 to 2.6

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