feat(openapi.json): Add Oauth2AuthenticationSession and update XAiCredential

This commit introduces a new object, Oauth2AuthenticationSession, which includes properties for the OAuth2 access token and its expiration. It also updates the XAiCredential schema to include an "authenticationSession" field, providing details about the authentication plan.

Author: fern-api[bot]

fern/apis/api/openapi.json

@@ -15580,6 +15580,20 @@
           "clientSecret"
         ]
       },
+      "Oauth2AuthenticationSession": {
+        "type": "object",
+        "properties": {
+          "accessToken": {
+            "type": "string",
+            "description": "This is the OAuth2 access token."
+          },
+          "expiresAt": {
+            "format": "date-time",
+            "type": "string",
+            "description": "This is the OAuth2 access token expiration."
+          }
+        }
+      },
       "CustomLLMCredential": {
         "type": "object",
         "properties": {
@@ -15620,6 +15634,14 @@
             "type": "string",
             "description": "This is the ISO 8601 date-time string of when the assistant was last updated."
           },
+          "authenticationSession": {
+            "description": "This is the authentication session for the credential. Available for credentials that have an authentication plan.",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/Oauth2AuthenticationSession"
+              }
+            ]
+          },
           "name": {
             "type": "string",
             "description": "This is the name of credential. This is just for your reference.",
@@ -16928,6 +16950,14 @@
             "type": "string",
             "description": "This is the ISO 8601 date-time string of when the assistant was last updated."
           },
+          "authenticationSession": {
+            "description": "This is the authentication session for the credential. Available for credentials that have an authentication plan.",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/Oauth2AuthenticationSession"
+              }
+            ]
+          },
           "name": {
             "type": "string",
             "description": "This is the name of credential. This is just for your reference.",
@@ -16941,7 +16971,8 @@
           "id",
           "orgId",
           "createdAt",
-          "updatedAt"
+          "updatedAt",
+          "authenticationSession"
         ]
       },
       "XAiCredential": {