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3 changes: 2 additions & 1 deletion prebid-server/endpoints/openrtb2/pbs-endpoint-auction.md
Original file line number Diff line number Diff line change
Expand Up @@ -1891,8 +1891,9 @@ ext.prebid.biddercontrols: {

Here's how this works:

1. If the bid adapter YAML declares support of multiformat, then `prefmtype` is ignored in the request. The default value of multiformat supported is `true`.
1. If the bid adapter YAML declares support of multiformat as `true`, then `prefmtype` is ignored in the request. The default value of multiformat supported is `false`.
1. If the bidder declares that they don't support multiformat and the incoming request contains multiple formats, then one of the formats is chosen by either `$.ext.prebid.biddercontrols.BIDDER.prefmtype` or config `auction.preferredmediatype.BIDDER`
1. If multiformat-supported is false, and if the specified prefmtype is not part of the request, then the imp doesn't go out to the bidder.

#### OpenRTB Response Extensions

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