Fix bug in generating code

Author: posquit0

lib/identif.js

@@ -50,6 +50,7 @@ class Identif {
    *
    * @param {object} extra - The extra data to store.
    * @param {object} [options={}] - The options of request operation.
+   * @param {number} [options.ttl] - The remaining time to live in the store.
    * @return {Object} The request information.
    */
   async request(extra, options = {}) {
@@ -60,8 +61,8 @@ class Identif {
     const ttl = options.ttl || this.store.options.ttl;
     const data = {
       id: this.requestIdGenerator(),
-      code: this.codeGenerator,
-      expireAt: new Date(now.getTime() + (1000 * ttl)),
+      code: this.codeGenerator(),
+      ttl: ttl,
       createdAt: now
     };
     // state, action, channel