Params.php

<?php
/**
 * Copyright 2016-2019, Optimizely
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

define('ACCOUNT_ID', 'account_id');
define('ACTIVATE_EVENT_KEY', 'campaign_activated');
define('ANONYMIZE_IP', 'anonymize_ip');
define('ATTRIBUTES', 'attributes');
define('CAMPAIGN_ID', 'campaign_id');
define('CLIENT_ENGINE', 'client_name');
define('CLIENT_VERSION', 'client_version');
define('CUSTOM_ATTRIBUTE_FEATURE_TYPE', 'custom');
define('DECISIONS', 'decisions');
define('ENRICH_DECISIONS', 'enrich_decisions');
define('ENTITY_ID', 'entity_id');
define('EVENTS', 'events');
define('EXPERIMENT_ID', 'experiment_id');
define('KEY', 'key');
define('PROJECT_ID', 'project_id');
define('REVISION', 'revision');
define('SNAPSHOTS', 'snapshots');
define('TIMESTAMP', 'timestamp');
define('TYPE', 'type');
define('UUID', 'uuid');
define('VALUE', 'value');
define('VARIATION_ID', 'variation_id');
define('VISITOR_ID', 'visitor_id');
define('VISITORS', 'visitors');
define('METADATA', 'metadata');
define('FLAG_KEY', 'flag_key');
define('RULE_KEY', 'rule_key');
define('RULE_TYPE', 'rule_type');
define('VARIATION_KEY', 'variation_key');