diff --git a/CHANGELOG.md b/CHANGELOG.md
index c11e1d1..054b1ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@ Latest
 ------
 
 ### Changes
+* [#52](https://github.com/cleverage/rest-process-bundle/issues/52) Give a code to the task ([cleverage/process-bundle#91](https://github.com/cleverage/process-bundle/issues/91)): `rest_request` (`task: rest_request`, with `cleverage/process-bundle` 5.4 or later, referencing it by `service` being deprecated there). The task has its class name as service id; fetching it directly from the service container is deprecated (`container.private`), it will be private in 4.0. The former id `cleverage_rest_process.task.request` is a deprecated alias, removed in 4.0. Update documentation, add tests.
 * [#50](https://github.com/cleverage/rest-process-bundle/issues/50) CI: test the lowest versions allowed by `composer.json` (`--prefer-lowest`, PHP 8.2). Raise `psr/log` to `^2 || ^3`: `cleverage/process-bundle` loggers and the test loggers use the typed `log()` signature, a fatal error with `psr/log` 1.
 * [#48](https://github.com/cleverage/rest-process-bundle/issues/48) `Client::geUri()` (deprecated since v3.2, use `getUri()`) triggers a deprecation at runtime with `trigger_deprecation()` (`symfony/deprecation-contracts`, now required). Add tests.
 * [#46](https://github.com/cleverage/rest-process-bundle/issues/46) Add a `.gitattributes`: the development files (`.docker/`, `.github/`, `tests/`, quality tools and PHPUnit configurations, `Makefile`) are no longer part of the archive installed by Composer (`dist`).
diff --git a/config/services/task.yaml b/config/services/task.yaml
index 575616f..7110ab9 100644
--- a/config/services/task.yaml
+++ b/config/services/task.yaml
@@ -1,13 +1,22 @@
 services:
-    cleverage_rest_process.task.request:
-        class: CleverAge\RestProcessBundle\Task\RequestTask
-        public: false
+    _defaults:
+        # Public for the direct access from the service container, deprecated since 3.3: private in 4.0
+        public: true
+        tags:
+            - { name: container.private, package: cleverage/rest-process-bundle, version: '3.3' }
+
+    CleverAge\RestProcessBundle\Task\RequestTask:
         shared: false
         arguments:
             - '@logger'
             - '@cleverage_rest_process.registry.client'
         tags:
             - { name: monolog.logger, channel: cleverage_process_task }
-    CleverAge\RestProcessBundle\Task\RequestTask:
-        alias: cleverage_rest_process.task.request
-        public: true
+            - { name: cleverage.task, code: rest_request }
+    cleverage_rest_process.task.request:
+        alias: CleverAge\RestProcessBundle\Task\RequestTask
+        public: false
+        deprecated:
+            package: cleverage/rest-process-bundle
+            version: '3.3'
+            message: 'The "%alias_id%" service alias is deprecated, use the "rest_request" task code or the class name of the task instead. It will be removed in 4.0.'
diff --git a/docs/cookbooks/api_to_dto.md b/docs/cookbooks/api_to_dto.md
index 0a2c13f..00d2cc0 100644
--- a/docs/cookbooks/api_to_dto.md
+++ b/docs/cookbooks/api_to_dto.md
@@ -56,7 +56,7 @@ clever_age_process:
             help: "bin/console cleverage:process:execute app.communes_export -c codePostal:\"'46800'\""
             tasks:
                 fetch:
-                    service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+                    task: rest_request
                     error_strategy: stop
                     options:
                         client: apicarto_ign
@@ -66,24 +66,24 @@ clever_age_process:
                     outputs: [deserialize]
 
                 deserialize:
-                    service: '@CleverAge\ProcessBundle\Task\Serialization\DeserializerTask'
+                    task: deserializer
                     options:
                         type: 'App\Dto\Commune[]'
                         format: json
                     outputs: [iterate]
 
                 iterate:
-                    service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+                    task: input_iterator
                     outputs: [normalize]
 
                 normalize:
-                    service: '@CleverAge\ProcessBundle\Task\Serialization\NormalizerTask'
+                    task: normalizer
                     options:
                         format: csv
                     outputs: [write]
 
                 write:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+                    task: csv_writer
                     options:
                         file_path: '%kernel.project_dir%/var/exports/communes_{date}.csv'
 ```
@@ -110,7 +110,7 @@ transformer:
 ```yaml
 # Task configuration level
 json_decode:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       callback:
diff --git a/docs/cookbooks/csv_to_api.md b/docs/cookbooks/csv_to_api.md
index f36e1ea..4ad3c34 100644
--- a/docs/cookbooks/csv_to_api.md
+++ b/docs/cookbooks/csv_to_api.md
@@ -35,13 +35,13 @@ clever_age_process:
             description: 'Push the products CSV file to the catalog API'
             tasks:
                 read:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+                    task: csv_reader
                     options:
                         file_path: '%kernel.project_dir%/var/data/products.csv'
                     outputs: [build_request]
 
                 build_request:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
@@ -64,7 +64,7 @@ clever_age_process:
                     outputs: [push]
 
                 push:
-                    service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+                    task: rest_request
                     error_strategy: skip # A rejected line does not stop the process
                     options:
                         client: catalog
@@ -76,10 +76,10 @@ clever_age_process:
                     error_outputs: [log_rejected]
 
                 count_pushed:
-                    service: '@CleverAge\ProcessBundle\Task\Reporting\StatCounterTask'
+                    task: stat_counter
 
                 log_rejected:
-                    service: '@CleverAge\ProcessBundle\Task\Reporting\LoggerTask'
+                    task: logger
                     options:
                         level: warning
                         message: 'Product rejected by the catalog API'
diff --git a/docs/index.md b/docs/index.md
index ad72d9f..7b4465e 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -21,7 +21,16 @@ CleverAge\RestProcessBundle\CleverAgeRestProcessBundle::class => ['all' => true]
 
 ## Configuration
 
-The bundle has no configuration of its own. Each API is accessed through a [REST client](reference/client.md): a
+The bundle has no configuration of its own. Its task is registered as a service (non-shared) and is used in your
+processes by its code, `rest_request` (`task: rest_request`, requires `cleverage/process-bundle` 5.4 or later, see its
+[task definition](https://github.com/cleverage/process-bundle/blob/main/docs/reference/02-task_definition.md)).
+Referencing it by its class name (`service: '@CleverAge\RestProcessBundle\Task\RequestTask'`) is deprecated since
+`cleverage/process-bundle` 5.4.
+
+Its service id is its class name. Fetching it directly from the service container is deprecated since 3.3 (it will be
+private in 4.0); its former id, `cleverage_rest_process.task.request`, is a deprecated alias since 3.3, removed in 4.0.
+
+Each API is accessed through a [REST client](reference/client.md): a
 service tagged `cleverage.rest.client`, identified by a unique code and holding the base URI of the API.
 
 ```yaml
@@ -43,7 +52,7 @@ The [RequestTask](reference/tasks/request_task.md) then references this client b
 ```yaml
 # Task configuration level
 fetch:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   options:
     client: apicarto_ign
     url: '/codes-postaux/communes/{codePostal}'
diff --git a/docs/reference/tasks/_template.md b/docs/reference/tasks/_template.md
index 919390a..041cd08 100644
--- a/docs/reference/tasks/_template.md
+++ b/docs/reference/tasks/_template.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `Fully\Qualified\ClassName`
+* **Code**: `rest_task_code` (`task: rest_task_code`)
 * **Iterable task** _(only if it implements `IterableTaskInterface`)_
 * **Blocking task** _(only if it implements `BlockingTaskInterface`)_
 * **Flushable task** _(only if it implements `FlushableTaskInterface`)_
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 code:
-  service: '@Fully\Qualified\ClassName'
+  task: task_code
   options:
     a: 1
     b: 2
diff --git a/docs/reference/tasks/request_task.md b/docs/reference/tasks/request_task.md
index 96eb4d4..8960e84 100644
--- a/docs/reference/tasks/request_task.md
+++ b/docs/reference/tasks/request_task.md
@@ -10,6 +10,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\RestProcessBundle\Task\RequestTask`
+* **Code**: `rest_request` (`task: rest_request`)
 
 Accepted inputs
 ---------------
@@ -74,7 +75,7 @@ services:
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   error_strategy: stop
   options:
     client: apicarto_ign
@@ -90,7 +91,7 @@ entry:
 ```yaml
 # Task configuration level
 list_books:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   options:
     client: domain_sample
     url: '/books'
@@ -107,7 +108,7 @@ list_books:
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   error_strategy: stop
   options:
     client: apicarto_ign
@@ -126,7 +127,7 @@ entry:
 ```yaml
 # Task configuration level
 get_token:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   options:
     client: domain_sample
     url: '/oauth/token'
@@ -147,7 +148,7 @@ get_token:
 ```yaml
 # Task configuration level
 update_book:
-  service: '@CleverAge\RestProcessBundle\Task\RequestTask'
+  task: rest_request
   error_strategy: skip
   options:
     client: domain_sample
diff --git a/tests/DependencyInjection/CleverAgeRestProcessExtensionTest.php b/tests/DependencyInjection/CleverAgeRestProcessExtensionTest.php
index 6b11dea..f076424 100644
--- a/tests/DependencyInjection/CleverAgeRestProcessExtensionTest.php
+++ b/tests/DependencyInjection/CleverAgeRestProcessExtensionTest.php
@@ -31,15 +31,27 @@ public function testServices(): void
 
         self::assertSame(ClientRegistry::class, $container->getDefinition('cleverage_rest_process.registry.client')->getClass());
 
-        $definition = $container->getDefinition('cleverage_rest_process.task.request');
-        self::assertSame(RequestTask::class, $definition->getClass());
+        // The class name is the service id
+        $definition = $container->getDefinition(RequestTask::class);
         // Tasks are stateful: each process execution must get its own instance
         self::assertFalse($definition->isShared());
         self::assertEquals([new Reference('logger'), new Reference('cleverage_rest_process.registry.client')], $definition->getArguments());
-
-        // Referenced as '@<class>' in process configurations
-        $alias = $container->getAlias(RequestTask::class);
-        self::assertSame('cleverage_rest_process.task.request', (string) $alias);
-        self::assertTrue($alias->isPublic());
+        self::assertSame([['channel' => 'cleverage_process_task']], $definition->getTag('monolog.logger'));
+        // Referenced by its code in the process configurations (task: <code>)
+        self::assertSame([['code' => 'rest_request']], $definition->getTag('cleverage.task'));
+        // Public for the direct access from the service container, deprecated
+        self::assertTrue($definition->isPublic());
+        self::assertSame([['package' => 'cleverage/rest-process-bundle', 'version' => '3.3']], $definition->getTag('container.private'));
+
+        // Former id, deprecated
+        $deprecatedId = 'cleverage_rest_process.task.request';
+        $alias = $container->getAlias($deprecatedId);
+        self::assertSame(RequestTask::class, (string) $alias);
+        self::assertFalse($alias->isPublic());
+        self::assertTrue($alias->isDeprecated());
+        self::assertSame(
+            ['package' => 'cleverage/rest-process-bundle', 'version' => '3.3', 'message' => 'The "'.$deprecatedId.'" service alias is deprecated, use the "rest_request" task code or the class name of the task instead. It will be removed in 4.0.'],
+            $alias->getDeprecation($deprecatedId)
+        );
     }
 }