Add changelog updates for 2025-02-27

Author: quantstruct-bot

fern/changelog/2025-02-27.mdx

@@ -0,0 +1,49 @@
+# Phone Keypad Input Support, OAuth2 and Analytics Improvements
+
+1. **Keypad Input Support for Phone Calls:** A new [`keypadInputPlan`](https://api.vapi.ai/api#:~:text=KeypadInputPlan) feature has been added to enable handling of DTMF (touch-tone) keypad inputs during phone calls. This allows your voice assistant to collect numeric input from callers, like account numbers, menu selections, or confirmation codes.
+
+Configuration options:
+```json
+{
+  "keypadInputPlan": {
+    "enabled": true,               // Default: false
+    "delimiters": "#",             // Options: "#", "*", or "" (empty string)
+    "timeoutSeconds": 2            // Range: 0.5-10 seconds, Default: 2
+  }
+}
+```
+
+The feature can be configured in:
+- `assistant.keypadInputPlan`
+- `call.squad.members.assistant.keypadInputPlan`
+- `call.squad.members.assistantOverrides.keypadInputPlan`
+
+2. **OAuth2 Authentication Enhancement:** The [`OAuth2AuthenticationPlan`](https://api.vapi.ai/api#:~:text=OAuth2AuthenticationPlan) now includes a `scope` property to specify access scopes when authenticating. This allows more granular control over permissions when integrating with OAuth2-based services.
+
+```json
+{
+  "credentials": [
+    {
+      "authenticationPlan": {
+        "type": "oauth2",
+        "url": "https://example.com/oauth2/token",
+        "clientId": "your-client-id",
+        "clientSecret": "your-client-secret",
+        "scope": "read:data"  // New property, max length: 1000 characters
+      }
+    }
+  ]
+}
+```
+
+The scope property can be configured at:
+- `assistant.credentials.authenticationPlan`
+- `call.squad.members.assistant.credentials.authenticationPlan`
+
+3. **New Analytics Metric: Minutes Used** The [`AnalyticsOperation`](https://api.vapi.ai/api#:~:text=AnalyticsOperation) schema now includes a new column option: `minutesUsed`. This metric allows you to track and analyze the duration of calls in your usage reports and analytics dashboards.
+
+
+4. **Removed TrieveKnowledgeBaseCreate Schema:** Removed `TrieveKnowledgeBaseCreate` schema from
+- `TrieveKnowledgeBase.createPlan`
+- `CreateTrieveKnowledgeBaseDTO.createPlan`
+- `UpdateTrieveKnowledgeBaseDTO.createPlan`