Field	Type	Details
id	string	A bidder generated ID for the bid object, used for tracking and debugging purposes, for example `3`.
impid	string	The ID of the impression object (`imp`) from the bid request to which this bid response applies, for example `"1"`
price	float	The bid price as a float value, expressed as CPM. All prices assumed to be in USD if the `cur` parameter is omitted, for example `1.23`
protocol*	integer	The Video response protocol of the markup if applicable, see the Video Response Protocols table for the valid values. Note: This field is required in video responses.
adm*	string	Creative markup. For native ads this field should include native response object as a JSON object or JSON-encoded string. For video ads this field should have VAST XML (inline or wrapper). No more than one win price macro can be used in the `adm` field, otherwise The MediaGrid records multiple impression events. When using an `<iframe>` to include markup and/or pixel trackers, you should close the `</iframe>` properly as not doing so may result in discrepancies on some browsers.
burl	string	(Required) Specifies the billing notice URL called by Commerce Grid using a server-to-server call when Commerce Grid records a billable impression. This field should contain the win price macro, and there can only be one win price macro, see the Macros section. The MediaGrid expects that `burl` calls should return a HTTP status `200`, `204`, or `30x`, see the Server-to-Server (s2s) Calls section for more information. You can respond with a non-secure `burl` for secure bid requests: `"burl":"http://dsp.com/winnotice?impid=102&winprice=${AUCTION_PRICE}"`
nurl	string	(Optional) The win notice URL called if the bid wins. This field should not be used for submitting creative markup. The URL can contain the win price macro, see the Macros section This URL will be mostly called from the user’s browser and should thus be SSL-compliant for requests with `imp.secure` set to `1`. `http://dsp.com/winnotice?impid=102&winprice=${AUCTION_PRICE}`
lurl*	string	Loss notification URL. Commerce Grid will call this URL when bid looses the auction, expanding macros.
iurl*	string	Sample image URL (without cache busting) for content checking, e.g. `"http://adserver.com/preview?impid=102"`
language*	string	The Alpha-2 ISO 639-1 code for the creative’s language, for example, `ja`. The nonstandard code `"xx"` may also be used if the creative has no linguistic content (e.g., a banner with just a company logo). Use this field instead of the deprecated `bid.ext.language` field.
adid*	string	ID that references the ad to be served if the bid wins. Either the `adid` field or `crid` field should be present in the response, for example `"3021"` Notes: It is recommended to have separate IDs for secure and non-secure versions of the same creative, e.g. `cr_123` & `cr_123_ssl` When Commerce Grid passes the creative ID to the publisher it prepends the Buyer ID, using the the following syntax: `{DSP_ID}_{Creative_ID}`, for example `70_650029457` or `79_0RsSUxZety0O1`. When Commerce Grid receives both `adid` and `crid` fields, the `adid` ID field is used to pass the creative ID to publishers
adomain	array of strings	Advertiser’s primary or top-level domain for advertiser checking. This can be a list of domains if there is a rotating creative. Note: The MediaGrid invalids non-ascii domains. If you need to pass a domain that uses unicode character such as in the Cyrillic or Japanese script, use punycode e.g. `детивнепитики.рф` or `faß.de`
bundle*	string	A platform-specific application identifier intended to be unique to the app and independent of the exchange. On Android, this should be a bundle or package name (e.g., com.foo.mygame)
cid*	string	Campaign ID or similar that is used by the Buyer to track and organize their campaigns, for example, `102`
crid*	string	Creative ID to assist with ad quality checking. Either the `adid` field or `crid` field should be present in the response, for example `“3021”` Notes: It is recommended to have separate IDs for secure and non-secure versions of the same creative, e.g. `cr_123` & `cr_123_ssl` When Commerce Grid passes the creative ID to the publisher it prepends the Buyer ID, using the the following syntax: `{DSP_ID}_{Creative_ID}`, for example `70_650029457` or `79_0RsSUxZety0O1`. When Commerce Grid receives both `adid` and `crid` fields, the `adid` ID field is used to pass the creative ID to publishers
attr*	array of integers	Creative attributes as defined in the OpenRTB protocol, for example, `[1,3]`.
dealid*	string	Reference to the `deal.id` from the bid request, if this bid pertains to a private marketplace direct deal, for example, `"AA-1234"`
h*	integer	The height of the creative in pixels when an alternative ad size is used, relevant for banner ads only. `250`.
w*	integer	The width of the creative in pixels when an alternative ad size is used, relevant for banner ads only. `300`.
cat*	array of strings	The IAB category of the creative.
slotinpod*	integer	Indicates that the bid response is only eligible for a specific position within a video or audio ad pod
mtype*	integer	Type of creative markup. The following values are supported: `1`: Banner `2`: Video `3`: Audio `4`: Native
dur*	integer	Duration of the video or audio creative in seconds.
ext*	object	This field may be required under certain circumstances, see Bid Ext Object.

Field	Type	Details
fidelity*	int	The fidelity-type of the attribution to track e.g `1`
nonce*	str	An ID unique to each ad response (GUID/UUID) e.g. `"beeeb65e-b3de-02420004"`
timestamp*	str	Unix time in millis string used at the time of signature
signature*	str	SKAdNetwork signature as specified by Apple e.g. `"MEQCIEQZRRyMyUXg=="`

SkAdNetwork Fidelities