add customer api

common/models/Customer.php

@@ -211,13 +211,13 @@ class Customer extends BaseFitnessActiveRecord implements IdentityInterface
     /**
      * Finds an identity by the given ID.
      * @param string|integer $id the ID to be looked for
-     * @return void the identity object that matches the given ID.
+     * @return Customer
      * Null should be returned if such an identity cannot be found
      * or the identity is not in an active state (disabled, deleted, etc.)
      */
     public static function findIdentity($id)
     {
-        Customer::findOne($id);
+        return self::findOne(['email' => $id]);
     }
 
     /**