diff --git a/application/controllers/api/v1/Appointments.php b/application/controllers/api/v1/Appointments.php
index a61a2f6c..bae447ca 100644
--- a/application/controllers/api/v1/Appointments.php
+++ b/application/controllers/api/v1/Appointments.php
@@ -84,7 +84,7 @@ class Appointments extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -120,6 +120,7 @@ class Appointments extends API_V1_Controller {
 
             $id = $this->appointments_model->add($appointment);
 
+            $appointment = $this->appointments_model->get_row($id);
             $service = $this->services_model->get_row($appointment['id_services']);
             $provider = $this->providers_model->get_row($appointment['id_users_provider']);
             $customer = $this->customers_model->get_row($appointment['id_users_customer']);
@@ -142,7 +143,7 @@ class Appointments extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -192,7 +193,7 @@ class Appointments extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -231,7 +232,7 @@ class Appointments extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 }
diff --git a/application/controllers/api/v1/Settings.php b/application/controllers/api/v1/Settings.php
index 7a9732de..74af732b 100644
--- a/application/controllers/api/v1/Settings.php
+++ b/application/controllers/api/v1/Settings.php
@@ -88,7 +88,7 @@ class Settings extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -116,7 +116,7 @@ class Settings extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -129,7 +129,7 @@ class Settings extends API_V1_Controller {
     {
         try
         {
-            $result = $this->settings_model->remove_setting($name);
+            $this->settings_model->remove_setting($name);
 
             $response = new Response([
                 'code' => 200,
@@ -140,7 +140,7 @@ class Settings extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 }
diff --git a/application/controllers/api/v1/Unavailabilities.php b/application/controllers/api/v1/Unavailabilities.php
index 71c123d4..ca043cbb 100644
--- a/application/controllers/api/v1/Unavailabilities.php
+++ b/application/controllers/api/v1/Unavailabilities.php
@@ -71,7 +71,7 @@ class Unavailabilities extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -102,7 +102,7 @@ class Unavailabilities extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -137,7 +137,7 @@ class Unavailabilities extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 
@@ -161,7 +161,7 @@ class Unavailabilities extends API_V1_Controller {
         }
         catch (Exception $exception)
         {
-            exit($this->handle_exception($exception));
+            $this->handle_exception($exception);
         }
     }
 }
diff --git a/engine/Api/V1/Parsers/Admins.php b/engine/Api/V1/Parsers/Admins.php
index 4f754f03..fac31fb0 100644
--- a/engine/Api/V1/Parsers/Admins.php
+++ b/engine/Api/V1/Parsers/Admins.php
@@ -29,7 +29,7 @@ class Admins implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'firstName' => $response['first_name'],
             'lastName' => $response['last_name'],
             'email' => $response['email'],
@@ -61,90 +61,90 @@ class Admins implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['firstName']))
+        if (array_key_exists('firstName', $request))
         {
             $decoded_request['first_name'] = $request['firstName'];
         }
 
-        if ( ! empty($request['lastName']))
+        if (array_key_exists('lastName', $request))
         {
             $decoded_request['last_name'] = $request['lastName'];
         }
 
-        if ( ! empty($request['email']))
+        if (array_key_exists('email', $request))
         {
             $decoded_request['email'] = $request['email'];
         }
 
-        if ( ! empty($request['mobile']))
+        if (array_key_exists('mobile', $request))
         {
             $decoded_request['mobile_number'] = $request['mobile'];
         }
 
-        if ( ! empty($request['phone']))
+        if (array_key_exists('phone', $request))
         {
             $decoded_request['phone_number'] = $request['phone'];
         }
 
-        if ( ! empty($request['address']))
+        if (array_key_exists('address', $request))
         {
             $decoded_request['address'] = $request['address'];
         }
 
-        if ( ! empty($request['city']))
+        if (array_key_exists('city', $request))
         {
             $decoded_request['city'] = $request['city'];
         }
 
-        if ( ! empty($request['state']))
+        if (array_key_exists('state', $request))
         {
             $decoded_request['state'] = $request['state'];
         }
 
-        if ( ! empty($request['zip']))
+        if (array_key_exists('zip', $request))
         {
             $decoded_request['zip_code'] = $request['zip'];
         }
 
-        if ( ! empty($request['notes']))
+        if (array_key_exists('notes', $request))
         {
             $decoded_request['notes'] = $request['notes'];
         }
 
-        if ( ! empty($request['timezone']))
+        if (array_key_exists('timezone', $request))
         {
             $decoded_request['timezone'] = $request['timezone'];
         }
 
-        if ( ! empty($request['settings']))
+        if (array_key_exists('settings', $request))
         {
             if (empty($decoded_request['settings']))
             {
                 $decoded_request['settings'] = [];
             }
 
-            if ( ! empty($request['settings']['username']))
+            if (array_key_exists('username', $request['settings']))
             {
                 $decoded_request['settings']['username'] = $request['settings']['username'];
             }
 
-            if ( ! empty($request['settings']['password']))
+            if (array_key_exists('password', $request['settings']))
             {
                 $decoded_request['settings']['password'] = $request['settings']['password'];
             }
 
-            if ($request['settings']['notifications'] !== NULL)
+            if (array_key_exists('notifications', $request['settings']))
             {
                 $decoded_request['settings']['notifications'] = filter_var($request['settings']['notifications'],
                     FILTER_VALIDATE_BOOLEAN);
             }
 
-            if ( ! empty($request['settings']['calendarView']))
+            if (array_key_exists('calendarView', $request['settings']))
             {
                 $decoded_request['settings']['calendar_view'] = $request['settings']['calendarView'];
             }
diff --git a/engine/Api/V1/Parsers/Appointments.php b/engine/Api/V1/Parsers/Appointments.php
index aa90eee9..24974e4b 100644
--- a/engine/Api/V1/Parsers/Appointments.php
+++ b/engine/Api/V1/Parsers/Appointments.php
@@ -29,7 +29,7 @@ class Appointments implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'book' => $response['book_datetime'],
             'start' => $response['start_datetime'],
             'end' => $response['end_datetime'],
@@ -76,57 +76,57 @@ class Appointments implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['book']))
+        if (array_key_exists('book', $request))
         {
             $decoded_request['book_datetime'] = $request['book'];
         }
 
-        if ( ! empty($request['start']))
+        if (array_key_exists('start', $request))
         {
             $decoded_request['start_datetime'] = $request['start'];
         }
 
-        if ( ! empty($request['end']))
+        if (array_key_exists('end', $request))
         {
             $decoded_request['end_datetime'] = $request['end'];
         }
 
-        if ( ! empty($request['hash']))
+        if (array_key_exists('hash', $request))
         {
             $decoded_request['hash'] = $request['hash'];
         }
 
-        if ( ! empty($request['location']))
+        if (array_key_exists('location', $request))
         {
             $decoded_request['location'] = $request['location'];
         }
 
-        if ( ! empty($request['notes']))
+        if (array_key_exists('notes', $request))
         {
             $decoded_request['notes'] = $request['notes'];
         }
 
-        if ( ! empty($request['customerId']))
+        if (array_key_exists('customerId', $request))
         {
             $decoded_request['id_users_customer'] = $request['customerId'];
         }
 
-        if ( ! empty($request['providerId']))
+        if (array_key_exists('providerId', $request))
         {
             $decoded_request['id_users_provider'] = $request['providerId'];
         }
 
-        if ( ! empty($request['serviceId']))
+        if (array_key_exists('serviceId', $request))
         {
             $decoded_request['id_services'] = $request['serviceId'];
         }
 
-        if ( ! empty($request['googleCalendarId']))
+        if (array_key_exists('googleCalendarId', $request))
         {
             $decoded_request['id_google_calendar'] = $request['googleCalendarId'];
         }
diff --git a/engine/Api/V1/Parsers/Categories.php b/engine/Api/V1/Parsers/Categories.php
index c270795d..6b2ea7a2 100644
--- a/engine/Api/V1/Parsers/Categories.php
+++ b/engine/Api/V1/Parsers/Categories.php
@@ -29,9 +29,9 @@ class Categories implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'name' => $response['name'],
-            'description' => $response['description']
+            'description' => array_key_exists('description', $response) ? $response['description'] : NULL
         ];
 
         $response = $encoded_response;
@@ -47,17 +47,17 @@ class Categories implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['name']))
+        if (array_key_exists('name', $request))
         {
             $decoded_request['name'] = $request['name'];
         }
 
-        if ( ! empty($request['description']))
+        if (array_key_exists('description', $request))
         {
             $decoded_request['description'] = $request['description'];
         }
diff --git a/engine/Api/V1/Parsers/Customers.php b/engine/Api/V1/Parsers/Customers.php
index 17df8a55..c6610774 100644
--- a/engine/Api/V1/Parsers/Customers.php
+++ b/engine/Api/V1/Parsers/Customers.php
@@ -29,7 +29,7 @@ class Customers implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'firstName' => $response['first_name'],
             'lastName' => $response['last_name'],
             'email' => $response['email'],
@@ -53,47 +53,47 @@ class Customers implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if ( array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['firstName']))
+        if ( array_key_exists('firstName', $request))
         {
             $decoded_request['first_name'] = $request['firstName'];
         }
 
-        if ( ! empty($request['lastName']))
+        if ( array_key_exists('lastName', $request))
         {
             $decoded_request['last_name'] = $request['lastName'];
         }
 
-        if ( ! empty($request['email']))
+        if ( array_key_exists('email', $request))
         {
             $decoded_request['email'] = $request['email'];
         }
 
-        if ( ! empty($request['phone']))
+        if ( array_key_exists('phone', $request))
         {
             $decoded_request['phone_number'] = $request['phone'];
         }
 
-        if ( ! empty($request['address']))
+        if ( array_key_exists('address', $request))
         {
             $decoded_request['address'] = $request['address'];
         }
 
-        if ( ! empty($request['city']))
+        if ( array_key_exists('city', $request))
         {
             $decoded_request['city'] = $request['city'];
         }
 
-        if ( ! empty($request['zip']))
+        if ( array_key_exists('zip', $request))
         {
             $decoded_request['zip_code'] = $request['zip'];
         }
 
-        if ( ! empty($request['notes']))
+        if ( array_key_exists('notes', $request))
         {
             $decoded_request['notes'] = $request['notes'];
         }
diff --git a/engine/Api/V1/Parsers/Providers.php b/engine/Api/V1/Parsers/Providers.php
index b2f41436..79fee1f1 100644
--- a/engine/Api/V1/Parsers/Providers.php
+++ b/engine/Api/V1/Parsers/Providers.php
@@ -29,7 +29,7 @@ class Providers implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'firstName' => $response['first_name'],
             'lastName' => $response['last_name'],
             'email' => $response['email'],
@@ -54,13 +54,27 @@ class Providers implements ParsersInterface {
                 'username' => $response['settings']['username'],
                 'notifications' => filter_var($response['settings']['notifications'], FILTER_VALIDATE_BOOLEAN),
                 'calendarView' => $response['settings']['calendar_view'],
-                'googleSync' => filter_var($response['settings']['google_sync'], FILTER_VALIDATE_BOOLEAN),
-                'googleCalendar' => $response['settings']['google_calendar'],
-                'googleToken' => $response['settings']['google_token'],
-                'syncFutureDays' => $response['settings']['sync_future_days'] !== NULL ? (int)$response['settings']['sync_future_days'] : NULL,
-                'syncPastDays' => $response['settings']['sync_past_days'] !== NULL ? (int)$response['settings']['sync_past_days'] : NULL,
-                'workingPlan' => json_decode($response['settings']['working_plan'], TRUE),
-                'workingPlanExceptions' => json_decode($response['settings']['working_plan_exceptions'], TRUE),
+                'googleSync' => array_key_exists('google_sync', $response['settings'])
+                    ? filter_var($response['settings']['google_sync'], FILTER_VALIDATE_BOOLEAN)
+                    : NULL,
+                'googleCalendar' => array_key_exists('google_calendar', $response['settings'])
+                    ? $response['settings']['google_calendar']
+                    : NULL,
+                'googleToken' => array_key_exists('google_token', $response['settings'])
+                    ? $response['settings']['google_token']
+                    : NULL,
+                'syncFutureDays' => array_key_exists('sync_future_days', $response['settings'])
+                    ? (int)$response['settings']['sync_future_days']
+                    : NULL,
+                'syncPastDays' => array_key_exists('sync_past_days', $response['settings'])
+                    ? (int)$response['settings']['sync_past_days']
+                    : NULL,
+                'workingPlan' => array_key_exists('working_plan', $response['settings'])
+                    ? json_decode($response['settings']['working_plan'], TRUE)
+                    : NULL,
+                'workingPlanExceptions' => array_key_exists('working_plan_exceptions', $response['settings'])
+                    ? json_decode($response['settings']['working_plan_exceptions'], TRUE)
+                    : NULL,
             ];
         }
 
@@ -77,131 +91,131 @@ class Providers implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['firstName']))
+        if (array_key_exists('firstName', $request))
         {
             $decoded_request['first_name'] = $request['firstName'];
         }
 
-        if ( ! empty($request['lastName']))
+        if (array_key_exists('lastName', $request))
         {
             $decoded_request['last_name'] = $request['lastName'];
         }
 
-        if ( ! empty($request['email']))
+        if (array_key_exists('email', $request))
         {
             $decoded_request['email'] = $request['email'];
         }
 
-        if ( ! empty($request['mobile']))
+        if (array_key_exists('mobile', $request))
         {
             $decoded_request['mobile_number'] = $request['mobile'];
         }
 
-        if ( ! empty($request['phone']))
+        if (array_key_exists('phone', $request))
         {
             $decoded_request['phone_number'] = $request['phone'];
         }
 
-        if ( ! empty($request['address']))
+        if (array_key_exists('address', $request))
         {
             $decoded_request['address'] = $request['address'];
         }
 
-        if ( ! empty($request['city']))
+        if (array_key_exists('city', $request))
         {
             $decoded_request['city'] = $request['city'];
         }
 
-        if ( ! empty($request['state']))
+        if (array_key_exists('state', $request))
         {
             $decoded_request['state'] = $request['state'];
         }
 
-        if ( ! empty($request['zip']))
+        if (array_key_exists('zip', $request))
         {
             $decoded_request['zip_code'] = $request['zip'];
         }
 
-        if ( ! empty($request['notes']))
+        if (array_key_exists('notes', $request))
         {
             $decoded_request['notes'] = $request['notes'];
         }
 
-        if ( ! empty($request['timezone']))
+        if (array_key_exists('timezone', $request))
         {
             $decoded_request['timezone'] = $request['timezone'];
         }
 
-        if ( ! empty($request['services']))
+        if (array_key_exists('services', $request))
         {
             $decoded_request['services'] = $request['services'];
         }
 
-        if ( ! empty($request['settings']))
+        if (array_key_exists('settings', $request))
         {
             if (empty($decoded_request['settings']))
             {
                 $decoded_request['settings'] = [];
             }
 
-            if ( ! empty($request['settings']['username']))
+            if (array_key_exists('username', $request['settings']))
             {
                 $decoded_request['settings']['username'] = $request['settings']['username'];
             }
 
-            if ( ! empty($request['settings']['password']))
+            if (array_key_exists('password', $request['settings']))
             {
                 $decoded_request['settings']['password'] = $request['settings']['password'];
             }
 
-            if ( ! empty($request['settings']['calendarView']))
+            if (array_key_exists('calendarView', $request['settings']))
             {
                 $decoded_request['settings']['calendar_view'] = $request['settings']['calendarView'];
             }
 
-            if ($request['settings']['notifications'] !== NULL)
+            if (array_key_exists('notifications', $request['settings']))
             {
                 $decoded_request['settings']['notifications'] = filter_var($request['settings']['notifications'],
                     FILTER_VALIDATE_BOOLEAN);
             }
 
-            if ($request['settings']['googleSync'] !== NULL)
+            if (array_key_exists('googleSync', $request['settings']))
             {
                 $decoded_request['settings']['google_sync'] = filter_var($request['settings']['googleSync'],
                     FILTER_VALIDATE_BOOLEAN);
             }
 
-            if ( ! empty($request['settings']['googleCalendar']))
+            if (array_key_exists('googleCalendar', $request['settings']))
             {
                 $decoded_request['settings']['google_calendar'] = $request['settings']['googleCalendar'];
             }
 
-            if ( ! empty($request['settings']['googleToken']))
+            if (array_key_exists('googleToken', $request['settings']))
             {
                 $decoded_request['settings']['google_token'] = $request['settings']['googleToken'];
             }
 
-            if ( ! empty($request['settings']['syncFutureDays']))
+            if (array_key_exists('syncFutureDays', $request['settings']))
             {
                 $decoded_request['settings']['sync_future_days'] = $request['settings']['syncFutureDays'];
             }
 
-            if ( ! empty($request['settings']['syncPastDays']))
+            if (array_key_exists('syncPastDays', $request['settings']))
             {
                 $decoded_request['settings']['sync_past_days'] = $request['settings']['syncPastDays'];
             }
 
-            if ( ! empty($request['settings']['workingPlan']))
+            if (array_key_exists('workingPlan', $request['settings']))
             {
                 $decoded_request['settings']['working_plan'] = json_encode($request['settings']['workingPlan']);
             }
 
-            if ( ! empty($request['settings']['workingPlanExceptions']))
+            if (array_key_exists('workingPlanExceptions', $request['settings']))
             {
                 $decoded_request['settings']['working_plan_exceptions'] = json_encode($request['settings']['workingPlanExceptions']);
             }
diff --git a/engine/Api/V1/Parsers/Secretaries.php b/engine/Api/V1/Parsers/Secretaries.php
index 05c88aeb..162fe559 100644
--- a/engine/Api/V1/Parsers/Secretaries.php
+++ b/engine/Api/V1/Parsers/Secretaries.php
@@ -29,7 +29,7 @@ class Secretaries implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'firstName' => $response['first_name'],
             'lastName' => $response['last_name'],
             'email' => $response['email'],
@@ -62,95 +62,95 @@ class Secretaries implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['firstName']))
+        if (array_key_exists('firstName', $request))
         {
             $decoded_request['first_name'] = $request['firstName'];
         }
 
-        if ( ! empty($request['lastName']))
+        if (array_key_exists('lastName', $request))
         {
             $decoded_request['last_name'] = $request['lastName'];
         }
 
-        if ( ! empty($request['email']))
+        if (array_key_exists('email', $request))
         {
             $decoded_request['email'] = $request['email'];
         }
 
-        if ( ! empty($request['mobile']))
+        if (array_key_exists('mobile', $request))
         {
             $decoded_request['mobile_number'] = $request['mobile'];
         }
 
-        if ( ! empty($request['phone']))
+        if (array_key_exists('phone', $request))
         {
             $decoded_request['phone_number'] = $request['phone'];
         }
 
-        if ( ! empty($request['address']))
+        if (array_key_exists('address', $request))
         {
             $decoded_request['address'] = $request['address'];
         }
 
-        if ( ! empty($request['city']))
+        if (array_key_exists('city', $request))
         {
             $decoded_request['city'] = $request['city'];
         }
 
-        if ( ! empty($request['state']))
+        if (array_key_exists('state', $request))
         {
             $decoded_request['state'] = $request['state'];
         }
 
-        if ( ! empty($request['zip']))
+        if (array_key_exists('zip', $request))
         {
             $decoded_request['zip_code'] = $request['zip'];
         }
 
-        if ( ! empty($request['notes']))
+        if (array_key_exists('notes', $request))
         {
             $decoded_request['notes'] = $request['notes'];
         }
 
-        if ( ! empty($request['timezone']))
+        if (array_key_exists('timezone', $request))
         {
             $decoded_request['timezone'] = $request['timezone'];
         }
 
-        if ( ! empty($request['providers']))
+        if (array_key_exists('providers', $request))
         {
             $decoded_request['providers'] = $request['providers'];
         }
 
-        if ( ! empty($request['settings']))
+        if (array_key_exists('settings', $request))
         {
             if (empty($decoded_request['settings']))
             {
                 $decoded_request['settings'] = [];
             }
 
-            if ( ! empty($request['settings']['username']))
+            if (array_key_exists('username', $request['settings']))
             {
                 $decoded_request['settings']['username'] = $request['settings']['username'];
             }
 
-            if ( ! empty($request['settings']['password']))
+            if (array_key_exists('password', $request['settings']))
             {
                 $decoded_request['settings']['password'] = $request['settings']['password'];
             }
 
-            if ($request['settings']['notifications'] !== NULL)
+            if (array_key_exists('notifications', $request['settings']))
             {
                 $decoded_request['settings']['notifications'] = filter_var($request['settings']['notifications'],
                     FILTER_VALIDATE_BOOLEAN);
             }
 
-            if ( ! empty($request['settings']['calendarView']))
+            if (array_key_exists('calendarView', $request['settings']))
             {
                 $decoded_request['settings']['calendar_view'] = $request['settings']['calendarView'];
             }
diff --git a/engine/Api/V1/Parsers/Services.php b/engine/Api/V1/Parsers/Services.php
index d4757084..c1de3581 100644
--- a/engine/Api/V1/Parsers/Services.php
+++ b/engine/Api/V1/Parsers/Services.php
@@ -29,7 +29,7 @@ class Services implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'name' => $response['name'],
             'duration' => (int)$response['duration'],
             'price' => (float)$response['price'],
@@ -54,52 +54,52 @@ class Services implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decoded_request['id'] = $request['id'];
         }
 
-        if ( ! empty($request['name']))
+        if (array_key_exists('name', $request))
         {
             $decoded_request['name'] = $request['name'];
         }
 
-        if ( ! empty($request['duration']))
+        if (array_key_exists('duration', $request))
         {
             $decoded_request['duration'] = $request['duration'];
         }
 
-        if ( ! empty($request['price']))
+        if (array_key_exists('price', $request))
         {
             $decoded_request['price'] = $request['price'];
         }
 
-        if ( ! empty($request['currency']))
+        if (array_key_exists('currency', $request))
         {
             $decoded_request['currency'] = $request['currency'];
         }
 
-        if ( ! empty($request['description']))
+        if (array_key_exists('description', $request))
         {
             $decoded_request['description'] = $request['description'];
         }
 
-        if ( ! empty($request['location']))
+        if (array_key_exists('location', $request))
         {
             $decoded_request['location'] = $request['location'];
         }
 
-        if ( ! empty($request['availabilitiesType']))
+        if (array_key_exists('availabilitiesType', $request))
         {
             $decoded_request['availabilities_type'] = $request['availabilitiesType'];
         }
 
-        if ( ! empty($request['attendantsNumber']))
+        if (array_key_exists('attendantsNumber', $request))
         {
             $decoded_request['attendants_number'] = $request['attendantsNumber'];
         }
 
-        if ( ! empty($request['categoryId']))
+        if (array_key_exists('categoryId', $request))
         {
             $decoded_request['id_service_categories'] = $request['categoryId'];
         }
diff --git a/engine/Api/V1/Parsers/Settings.php b/engine/Api/V1/Parsers/Settings.php
index 48a19c71..591c5842 100644
--- a/engine/Api/V1/Parsers/Settings.php
+++ b/engine/Api/V1/Parsers/Settings.php
@@ -46,12 +46,12 @@ class Settings implements ParsersInterface {
     {
         $decoded_request = $base ?: [];
 
-        if ( ! empty($request['name']))
+        if (array_key_exists('name', $request))
         {
             $decoded_request['name'] = $request['name'];
         }
 
-        if ( ! empty($request['value']))
+        if (array_key_exists('value', $request))
         {
             $decoded_request['value'] = $request['value'];
         }
diff --git a/engine/Api/V1/Parsers/Unavailabilities.php b/engine/Api/V1/Parsers/Unavailabilities.php
index 09d0b142..40b8b898 100644
--- a/engine/Api/V1/Parsers/Unavailabilities.php
+++ b/engine/Api/V1/Parsers/Unavailabilities.php
@@ -29,13 +29,17 @@ class Unavailabilities implements ParsersInterface {
     public function encode(array &$response)
     {
         $encoded_response = [
-            'id' => $response['id'] !== NULL ? (int)$response['id'] : NULL,
+            'id' => array_key_exists('id', $response) ? (int)$response['id'] : NULL,
             'book' => $response['book_datetime'],
             'start' => $response['start_datetime'],
             'end' => $response['end_datetime'],
             'notes' => $response['notes'],
-            'providerId' => $response['id_users_provider'] !== NULL ? (int)$response['id_users_provider'] : NULL,
-            'googleCalendarId' => $response['id_google_calendar'] !== NULL ? (int)$response['id_google_calendar'] : NULL
+            'providerId' => array_key_exists('id_users_provider', $response)
+                ? (int)$response['id_users_provider']
+                : NULL,
+            'googleCalendarId' => array_key_exists('id_google_calendar', $response)
+                ? (int)$response['id_google_calendar']
+                : NULL
         ];
 
         $response = $encoded_response;
@@ -51,37 +55,37 @@ class Unavailabilities implements ParsersInterface {
     {
         $decodedRequest = $base ?: [];
 
-        if ( ! empty($request['id']))
+        if (array_key_exists('id', $request))
         {
             $decodedRequest['id'] = $request['id'];
         }
 
-        if ( ! empty($request['book']))
+        if (array_key_exists('book', $request))
         {
             $decodedRequest['book_datetime'] = $request['book'];
         }
 
-        if ( ! empty($request['start']))
+        if (array_key_exists('start', $request))
         {
             $decodedRequest['start_datetime'] = $request['start'];
         }
 
-        if ( ! empty($request['end']))
+        if (array_key_exists('end', $request))
         {
             $decodedRequest['end_datetime'] = $request['end'];
         }
 
-        if ( ! empty($request['notes']))
+        if (array_key_exists('notes', $request))
         {
             $decodedRequest['notes'] = $request['notes'];
         }
 
-        if ( ! empty($request['providerId']))
+        if (array_key_exists('providerId', $request))
         {
             $decodedRequest['id_users_provider'] = $request['providerId'];
         }
 
-        if ( ! empty($request['googleCalendarId']))
+        if (array_key_exists('googleCalendarId', $request))
         {
             $decodedRequest['id_google_calendar'] = $request['googleCalendarId'];
         }