{
  "openapi": "3.1.0",
  "info": {
    "title": "Salesforce Change Data Capture API",
    "description": "REST API endpoints for managing Change Data Capture (CDC) channel subscriptions and retrieving change event metadata. CDC provides near-real-time notifications of Salesforce record changes (create, update, delete, undelete) as event messages. Subscribers consume events via CometD (Streaming API), Pub/Sub API, or Apex triggers. The REST endpoints manage which objects are enabled for CDC and provide event metadata.",
    "version": "63.0",
    "contact": {
      "name": "Salesforce Developer Support",
      "url": "https://developer.salesforce.com/support",
      "email": "developer@salesforce.com"
    },
    "license": {
      "name": "Salesforce API Terms of Use",
      "url": "https://www.salesforce.com/company/legal/agreements/"
    }
  },
  "servers": [
    {
      "url": "https://{instance}.salesforce.com/services/data/v63.0",
      "description": "Salesforce production or developer instance",
      "variables": {
        "instance": {
          "default": "yourInstance",
          "description": "Your Salesforce instance identifier"
        }
      }
    }
  ],
  "security": [
    {
      "oauth2": []
    },
    {
      "bearerAuth": []
    }
  ],
  "paths": {
    "/sobjects/{changeEventName}": {
      "get": {
        "operationId": "describeChangeEvent",
        "summary": "Describe a Change Data Capture event",
        "description": "Returns metadata about a Change Data Capture event type. Change event names follow the pattern {SObjectName}ChangeEvent (e.g., AccountChangeEvent, ContactChangeEvent) for standard objects, or {CustomObjectName}__ChangeEvent for custom objects.",
        "tags": ["Change Events"],
        "parameters": [
          {
            "name": "changeEventName",
            "in": "path",
            "required": true,
            "description": "The API name of the Change Data Capture event (e.g., AccountChangeEvent, ContactChangeEvent, MyObject__ChangeEvent)",
            "schema": {
              "type": "string",
              "pattern": ".*ChangeEvent$"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Change event metadata",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ChangeEventDescribe"
                }
              }
            }
          }
        }
      }
    },
    "/sobjects/{changeEventName}/describe": {
      "get": {
        "operationId": "describeChangeEventFull",
        "summary": "Get full Change Data Capture event describe",
        "description": "Returns complete metadata for a CDC event type including all available change event fields and their properties.",
        "tags": ["Change Events"],
        "parameters": [
          {
            "name": "changeEventName",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string",
              "pattern": ".*ChangeEvent$"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Full change event describe",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ChangeEventDescribe"
                }
              }
            }
          }
        }
      }
    },
    "/sobjects/{changeEventName}/eventSchema": {
      "get": {
        "operationId": "getChangeEventSchema",
        "summary": "Get the Avro schema for a Change Data Capture event",
        "description": "Returns the Apache Avro schema for a Change Data Capture event channel, used by the Pub/Sub API.",
        "tags": ["Change Events"],
        "parameters": [
          {
            "name": "changeEventName",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Change event Avro schema",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "additionalProperties": true
                }
              }
            }
          }
        }
      }
    },
    "/knowledgeManagement/settings": {
      "get": {
        "operationId": "getCDCEnabledEntities",
        "summary": "Get CDC-enabled entities",
        "description": "Returns entities that have Change Data Capture enabled via the tooling API or setup UI. Note: This is accessed through the Tooling API ChangeDataCaptureChannelMembers query.",
        "tags": ["Configuration"],
        "responses": {
          "200": {
            "description": "CDC configuration",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "additionalProperties": true
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "oauth2": {
        "type": "oauth2",
        "flows": {
          "authorizationCode": {
            "authorizationUrl": "https://login.salesforce.com/services/oauth2/authorize",
            "tokenUrl": "https://login.salesforce.com/services/oauth2/token",
            "scopes": {
              "api": "Access and manage your Salesforce data"
            }
          }
        }
      },
      "bearerAuth": {
        "type": "http",
        "scheme": "bearer"
      }
    },
    "schemas": {
      "ChangeEventDescribe": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "The API name of the change event (e.g., AccountChangeEvent)"
          },
          "label": {
            "type": "string"
          },
          "labelPlural": {
            "type": "string"
          },
          "fields": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "name": {
                  "type": "string"
                },
                "label": {
                  "type": "string"
                },
                "type": {
                  "type": "string"
                },
                "nillable": {
                  "type": "boolean"
                }
              }
            }
          },
          "associateEntityType": {
            "type": ["string", "null"],
            "description": "The associated entity type (ChangeEvent)"
          },
          "associateParentEntity": {
            "type": "string",
            "description": "The parent SObject type that this change event tracks (e.g., Account, Contact)"
          }
        }
      },
      "ChangeEventMessage": {
        "type": "object",
        "description": "The structure of a Change Data Capture event message as received by subscribers. Contains the event header with change metadata and the changed field values.",
        "properties": {
          "ChangeEventHeader": {
            "type": "object",
            "description": "Header containing metadata about the change",
            "properties": {
              "entityName": {
                "type": "string",
                "description": "The SObject type that changed (e.g., Account)"
              },
              "recordIds": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "Array of record IDs that changed (may be batched)"
              },
              "changeType": {
                "type": "string",
                "enum": ["CREATE", "UPDATE", "DELETE", "UNDELETE", "GAP_CREATE", "GAP_UPDATE", "GAP_DELETE", "GAP_UNDELETE", "GAP_OVERFLOW"],
                "description": "The type of change. GAP_ prefixed types indicate events replayed after a gap in delivery."
              },
              "changeOrigin": {
                "type": "string",
                "description": "The origin of the change (e.g., com/salesforce/api/rest/63.0)"
              },
              "transactionKey": {
                "type": "string",
                "description": "Unique key identifying the transaction that caused the change"
              },
              "sequenceNumber": {
                "type": "integer",
                "description": "Sequence number for ordering within a transaction"
              },
              "commitTimestamp": {
                "type": "integer",
                "description": "Unix timestamp in milliseconds when the change was committed"
              },
              "commitNumber": {
                "type": "integer",
                "description": "System change number for ordering"
              },
              "commitUser": {
                "type": "string",
                "description": "The 18-character ID of the user who made the change"
              },
              "changedFields": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "List of field API names that changed (for UPDATE events)"
              },
              "nulledFields": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "List of field API names that were set to null"
              },
              "diffFields": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "List of fields included in the change event payload"
              }
            }
          }
        },
        "additionalProperties": true
      }
    }
  },
  "tags": [
    {
      "name": "Change Events",
      "description": "Change Data Capture event metadata and schema"
    },
    {
      "name": "Configuration",
      "description": "CDC configuration and enabled entities"
    }
  ]
}