Fix schain documentation tentatively

dev-docs/show-prebid-ads-on-amp-pages.md

@@ -65,10 +65,8 @@ that doesn't come from /amp parameters:
     "id": "some-request-id",
     "cur": ["USD"],
     "source": {
-        "ext": {
-            "schain": {
-                ...
-            }
+        "schain": {
+            ...
         }
     },
     "site": {

prebid-server/developers/add-new-bidder-go.md

@@ -877,7 +877,7 @@ There are a several values of a bid that publishers expect to be populated. Some
 | [First Party Data (FPD)](https://docs.prebid.org/prebid-server/features/pbs-fpd.html)| Prebid | `request.imp[].ext.context.data.*`, `request.app.ext.data.*`, `request.site.ext.data.*`, `request.user.ext.data.*` <br/> The publisher may provide first party data (e.g. keywords).
 | GDPR | OpenRTB |  `request.regs.ext.gdpr`, `request.user.ext.consent` <br/> The publisher is specifying the European General Data Protection Regulation flag and TCF consent string.
 | Site or App | OpenRTB | `request.site`, `request.app` <br/> The publisher will provide either the site or app, but not both, representing the client's device.
-| Supply Chain | OpenRTB | `request.source.ext.schain` <br/> The publisher's declaration of all parties who are selling or reselling the bid request.
+| Supply Chain | OpenRTB | `request.source.schain` <br/> The publisher's declaration of all parties who are selling or reselling the bid request.
 | Test | OpenRTB | `request.test` <br/> The publisher is sending non-production traffic which also enables verbose debugging information from Prebid Server.
 | Video | OpenRTB | `request.imp[].video` <br/> The publisher is specifying video ad requirements or preferences.
 

prebid-server/developers/add-new-bidder-java.md

@@ -608,7 +608,7 @@ There are a several values of a bid request that publishers may supply that your
 | [First Party Data (FPD)](https://docs.prebid.org/prebid-server/features/pbs-fpd.html)| Prebid | `request.imp[].ext.context.data.*`, `request.app.ext.data.*`, `request.site.ext.data.*`, `request.user.ext.data.*` <br/> The publisher may provide first party data (e.g. keywords).
 | GDPR | OpenRTB |  `request.regs.ext.gdpr`, `request.user.ext.consent` <br/> The publisher is specifying the European General Data Protection Regulation flag and TCF consent string.
 | Site or App | OpenRTB | `request.site`, `request.app` <br/> The publisher will provide either the site or app, but not both, representing the client's device.
-| Supply Chain | OpenRTB | `request.source.ext.schain` <br/> The publisher's declaration of all parties who are selling or reselling the bid request.
+| Supply Chain | OpenRTB | `request.source.schain` <br/> The publisher's declaration of all parties who are selling or reselling the bid request.
 | Test | OpenRTB | `request.test` <br/> The publisher is sending non-production traffic which also enables verbose debugging information from Prebid Server.
 | Video | OpenRTB | `request.imp[].video` <br/> The publisher is specifying video ad requirements or preferences.
 | Rewarded inventory | OpenRTB | `request.imp[].ext.prebid.is_rewarded_inventory` <br/> Signal to indicate the inventory is rewarded.

prebid-server/endpoints/openrtb2/auction-request-example.md

@@ -110,7 +110,7 @@ It serves 2 purposes:
             },
             "schains": [{
                 "bidders": ["bidderA"],
-                "schain": { SCHAIN OBJECT 1} // bid adapters will see their schain on source.[ext.]schain.
+                "schain": { SCHAIN OBJECT 1} // bid adapters will see their schain on source.schain.
             }],
             "server": {
                 "externalurl": "https://prebid-server.example.com",

prebid-server/endpoints/openrtb2/pbs-endpoint-auction.md

@@ -142,7 +142,7 @@ Prebid Server accepts all OpenRTB 2.x fields and passes them in the request to a
 | user.consent | 2.6 | Bidders supporting 2.5 only: downgraded to user.ext.consent |
 | imp.rwdd | 2.6 | Bidders supporting 2.5 only: downgraded to imp[].ext.prebid.is_rewarded_inventory |
 | user.eids | 2.6 | Bidders supporting 2.5 only: downgraded to user.ext.eids |
-| source.schain | 2.6 | Bidders supporting 2.5 only: downgraded to source.ext.schain |
+| source.schain | 2.6 | Bidders supporting 2.5 only: downgraded to source.ext.schain, Bidders supporting 2.4 only: downgraded to ext.schain |
 | wlangb, {content, device}.langb, cattax, {site, app, publisher, content, producer}.cattax, ssai, {app, site}.content.{network, channel}, {app, content, site, user}.kwarray, device.sua | 2.6 | Bidders supporting 2.5 only: these fields are removed |
 | {video, audio}.{rqddurs, maxseq, poddur, podid, podseq, mincpmpersec, slotinpod} | 2.6 | Bidders supporting 2.5 only: these fields are removed |
 | regs.gpp | 2.6-202211 | Bidders supporting 2.5 only: this field is removed |
@@ -998,7 +998,13 @@ An additional option is `usepbsrates`. When `true`, this flag indicates that dyn
 
 ##### Supply Chain Support
 
-Basic supply chains are passed to Prebid Server on `source.ext.schain` and passed through to bid adapters. Prebid Server does not currently offer the ability to add a node to the supply chain.
+Basic supply chains are passed to Prebid Server on `source.schain` and passed through to bid adapters. Prebid Server does not currently offer the ability to add a node to the supply chain.
+
+See
+[OpenRTB 2.6, Section 3.2.2 - Object: Source](https://github.com/InteractiveAdvertisingBureau/openrtb2.x/blob/2.6-202501/2.6.md#322---object-source-)
+and
+[OpenRTB 2.6, Section 3.2.25 - Object: SupplyChain](https://github.com/InteractiveAdvertisingBureau/openrtb2.x/blob/2.6-202501/2.6.md#3225---object-supplychain-)
+.
 
 Bidder-specific schains:
 
@@ -1011,7 +1017,7 @@ Bidder-specific schains:
 
 In this scenario, Prebid Server sends the first schain object to `bidderA` and the second schain object to everyone else.
 
-If there's already an source.ext.schain and a bidder is named in ext.prebid.schains (or covered by the wildcard condition), ext.prebid.schains takes precedent.
+If there's already an source.schain and a bidder is named in ext.prebid.schains (or covered by the wildcard condition), ext.prebid.schains takes precedent.
 
 ##### User IDs
 

prebid-server/features/pbs-feature-idx.md

@@ -63,8 +63,9 @@ title: Prebid Server | Features
 | First Party Data | Bidder-specific impression data | Accepts [bidder-specific first party data attributes at the imp-level](/prebid-server/endpoints/openrtb2/pbs-endpoint-auction.html#bidder-specific-impression-level-fpd). | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
 | First Party Data | AMP first party data | Accepts [first party data attributes on an AMP request](/prebid-server/endpoints/openrtb2/pbs-endpoint-amp.html#first-party-data). | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
 | [Supply Chain](/prebid-server/endpoints/openrtb2/pbs-endpoint-auction.html#supply-chain-support) | Bidder-specific schains | Accepts bidder-specific schain | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
-| Supply Chain | Host SChain | The host company can supply a global schain that's appended to the list of incoming nodes in source.ext.schain. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
-| Supply Chain | ORTB 2.4 compatibility | If source.ext.schain doesn't exist but ext.schain does, PBS copies the latter to the former. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | |
+| Supply Chain | Host SChain | The host company can supply a global schain that's appended to the list of incoming nodes in source.schain. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
+| Supply Chain | ORTB 2.5 compatibility | If source.schain doesn't exist but source.ext.schain does, PBS copies the latter to the former. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | |
+| Supply Chain | ORTB 2.4 compatibility | If source.schain doesn't exist but ext.schain does, PBS copies the latter to the former. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | |
 | Publisher Accounts | Core | Ability to enforce that requests coming in have a valid account ID. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
 | Publisher Accounts | AMP account parameter | Accept the account parameter on the AMP request. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |
 | Publisher Accounts | Account-specific TTLs | Allow each account ID to have a custom PBC time-to-live for banner and video. | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> | <img alt="check" src="/assets/images/icons/icon-check-green.png" width="30"> |