Add vapi: 10 doc-sourced server-message payloads

providers/vapi/index.json

@@ -0,0 +1,8 @@
+{
+  "label": "Vapi",
+  "configs": {
+    "latest_version": "latest",
+    "topic_identifier": "message.type"
+  },
+  "provenance_note": "intentionally undeclared: this version is mixed \u2014 10 doc-sourced files carry a `source` key, 2 captures do not. sourced_via has no value for a mixed version, and Vapi has no version scheme to split them into."
+}

providers/vapi/latest/call.endpointing.request.json

@@ -0,0 +1,17 @@
+{
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "message": {
+      "type": "call.endpointing.request",
+      "messagesOpenAIFormatted": []
+    }
+  },
+  "topic": "call.endpointing.request",
+  "source": {
+    "type": "vendor-documentation",
+    "url": "https://docs.vapi.ai/server-url/events",
+    "retrieved": "2026-08-12"
+  }
+}

providers/vapi/latest/conversation-update.json

@@ -0,0 +1,18 @@
+{
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "message": {
+      "type": "conversation-update",
+      "messages": [],
+      "messagesOpenAIFormatted": []
+    }
+  },
+  "topic": "conversation-update",
+  "source": {
+    "type": "vendor-documentation",
+    "url": "https://docs.vapi.ai/server-url/events",
+    "retrieved": "2026-08-12"
+  }
+}