[shawnhe]

…d in mtype.

🔧 Type of changes

• new bid adapter
• bid adapter update
• new feature
• new analytics adapter
• new module
• module update
• bugfix
• documentation
• configuration
• dependency update
• tech debt (test coverage, refactorings, etc.)

✨ What's the context?

Nativo's server sets mtype on every bid. The adapter ignored it and inferred the media type from the request imp (native, then video, then banner), which mislabels bids on multi-format imps, for example a banner win on a banner + video imp reported as video.

🧠 Rationale behind the change

The adapter now uses bid.MType (1 banner, 2 video, 3 audio, 4 native) when present, as Prebid recommends. If it's missing or unrecognized, the existing imp-based and ext.prebid.type logic runs unchanged, so responses without mtype behave as before. New fixtures cover multi-format imps, audio, an unrecognized mtype and an unknown imp.

🔎 New Bid Adapter Checklist

• verify email contact works
• NO fully dynamic hostnames
• geographic host parameters are NOT required
• direct use of HTTP is prohibited - implement an existing Bidder interface that will do all the job
• if the ORTB is just forwarded to the endpoint, use the generic adapter - define the new adapter as the alias of the generic adapter
• cover an adapter configuration with an integration test

🧪 Test plan

How do you know the changes are safe to ship to production?

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code?
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes?