Requests v3 migration guide + docs updates

docs.json

@@ -119,6 +119,12 @@
                   "references/api/api_guides/webhooks"
                 ]
               },
+              {
+                "group": "Migration Guides",
+                "pages": [
+                  "references/api/api_guides/migrating-to-requests-v3"
+                ]
+              },
               {
                 "group": "Chains, Tokens, Contracts",
                 "pages": [
@@ -155,6 +161,7 @@
               {
                 "group": "Deprecated",
                 "pages": [
+                  "references/api/get-requests-v2",
                   "references/api/get-price",
                   "references/api/get-config",
                   "references/api/get-intents-status",

references/api/api_core_concepts/fees.mdx

@@ -115,25 +115,29 @@ _Please note that the above fee structure applies to standard cases. In certain
 
 ## Fees in the API
 
-Both the quote API and the requests API return a request's fees in the `expandedPriceImpact` object, which breaks them down into the following components:
+[`GET /requests/v3`](/references/api/get-requests) returns a request's fees in the `data.fees` object, with `quoted` (estimated at quote time) and `actual` (computed at fill time) values. It breaks fees down into the following components:
 
 **execution** - Execution fees covering network gas on the origin and/or destination chain plus the flat fee.
 
 **swap** - Swap costs from cross-currency and cross-chain exchange, including DEX fees, swap slippage, and solver rebalancing.
 
-**relay** - The Relay fee, the flat basis-point fee charged by Relay for routing and meta-aggregation services.
+**platform** - The platform fee, the flat basis-point fee charged by Relay for routing and meta-aggregation services.
 
 **app** - App fees added on top by the integrator, when present.
 
 **sponsored** - The portion of fees the integrator subsidizes on behalf of the user via [Fee Sponsorship](/features/fee-sponsorship).
 
 <Tip>
-When displaying fees to users, we recommend mapping the `expandedPriceImpact` fields as follows:
-- **relay** → Provider Fee
+When displaying fees to users, we recommend mapping the `data.fees` fields as follows:
+- **platform** → Provider Fee
 - **app** → Your App's Fee
 - **swap** + **execution** → Swap Impact
 </Tip>
 
+<Note>
+In the quote API and [`GET /requests/v2`](/references/api/get-requests-v2), this same breakdown is returned as the `expandedPriceImpact` object, and the **platform** component is named **relay**.
+</Note>
+
 ## Fee Sponsorship
 
 Integrators with [Fee Sponsorship](/features/fee-sponsorship) enabled can subsidize fees for their users. By default, setting **`subsidizeFees`** to `true` sponsors all fee components.
@@ -147,9 +151,9 @@ See the [Fee Sponsorship Doc](/features/fee-sponsorship) for setup details.
 ## Deprecated: Fees Object
 
 <Warning>
-The `fees` object is deprecated. It is still returned from the quote API and the [`GET /requests/v2`](/references/api/get-requests) API for backwards compatibility, but it only reports Relay-related fees and does not reflect the full cost of a request. Do not rely on it for new integrations.
+The `fees` object is deprecated. It is still returned from the quote API and the [`GET /requests/v2`](/references/api/get-requests-v2) API for backwards compatibility, but it only reports Relay-related fees and does not reflect the full cost of a request. Do not rely on it for new integrations.
 
-To understand or display the complete fee breakdown of a request, use the [`expandedPriceImpact`](#fees-in-the-api) object instead, which covers execution, swap, relay, app, and sponsored fees.
+To understand or display the complete fee breakdown of a request, use the [`data.fees`](#fees-in-the-api) object in `GET /requests/v3` (or `expandedPriceImpact` in the quote API and `GET /requests/v2`) instead, which covers execution, swap, platform, app, and sponsored fees.
 </Warning>
 
 The deprecated `fees` object is segmented into the following fields: