diff --git a/.idea/combadge.iml b/.idea/combadge.iml
index d34ef58..0e6c152 100644
--- a/.idea/combadge.iml
+++ b/.idea/combadge.iml
@@ -2,8 +2,8 @@
 <module type="PYTHON_MODULE" version="4">
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/combadge" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/.venv" />
       <excludeFolder url="file://$MODULE_DIR$/.mypy_cache" />
       <excludeFolder url="file://$MODULE_DIR$/.pytest_cache" />
@@ -12,7 +12,7 @@
       <excludeFolder url="file://$MODULE_DIR$/.cache" />
       <excludeFolder url="file://$MODULE_DIR$/_site" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.13 virtualenv at ~/GitHub/combadge/.venv" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3.13 (combadge)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
   <component name="PackageRequirementsSettings">
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 36d0c47..b1f658c 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -3,7 +3,7 @@
   <component name="Black">
     <option name="sdkName" value="Poetry (combadge)" />
   </component>
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.13 virtualenv at ~/GitHub/combadge/.venv" project-jdk-type="Python SDK" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.13 (combadge)" project-jdk-type="Python SDK" />
   <component name="PythonCompatibilityInspectionAdvertiser">
     <option name="version" value="3" />
   </component>
diff --git a/combadge/support/http/markers/request.py b/combadge/support/http/markers/request.py
index 50aec29..3b01ebf 100644
--- a/combadge/support/http/markers/request.py
+++ b/combadge/support/http/markers/request.py
@@ -143,55 +143,37 @@ def __call__(self, request: ContainsQueryParams, value: Any) -> None:  # noqa: D
             request.query_params.append((self.name, sub_value.value if isinstance(sub_value, Enum) else sub_value))
 
 
-if not TYPE_CHECKING:
-
-    @dataclass(**SLOTS)
-    class Payload(ParameterMarker[ContainsPayload]):
-        """
-        Mark parameter as a request payload.
-
-        An argument gets converted to a dictionary and passed over to a backend.
-
-        Examples:
-            Simple usage:
-
-            >>> def call(body: Payload[BodyModel]) -> ...:
-            >>>     ...
-
-            Equivalent expanded usage:
+@dataclass(**SLOTS)
+class Payload(ParameterMarker[ContainsPayload]):
+    """
+    Mark parameter as a request payload.
 
-            >>> def call(body: Annotated[BodyModel, Payload()]) -> ...:
-            >>>     ...
-        """
+    An argument gets converted to a dictionary and passed over to a backend.
 
-        exclude_unset: bool = False
-        by_alias: bool = False
+    Examples:
+        >>> def call(body: Annotated[BodyModel, Payload()]) -> ...:
+        >>>     ...
+    """
 
-        @override
-        def __call__(self, request: ContainsPayload, value: Any) -> None:  # noqa: D102
-            value = get_type_adapter(type(value)).dump_python(
-                value,
-                by_alias=self.by_alias,
-                exclude_unset=self.exclude_unset,
-            )
-            if request.payload is None:
-                request.payload = value
-            elif isinstance(request.payload, dict):
-                request.payload.update(value)  # merge into the existing payload
-            else:
-                raise ValueError(f"attempting to merge `{type(value)}` into `{type(request.payload)}`")
+    exclude_unset: bool = False
+    by_alias: bool = False
 
-        def __class_getitem__(cls, item: type[Any]) -> Any:
-            return Annotated[item, cls()]
+    @override
+    def __call__(self, request: ContainsPayload, value: Any) -> None:  # noqa: D102
+        value = get_type_adapter(type(value)).dump_python(
+            value,
+            by_alias=self.by_alias,
+            exclude_unset=self.exclude_unset,
+        )
+        if request.payload is None:
+            request.payload = value
+        elif isinstance(request.payload, dict):
+            request.payload.update(value)  # merge into the existing payload
+        else:
+            raise ValueError(f"attempting to merge `{type(value)}` into `{type(request.payload)}`")
 
-else:
-    # Abandon hope all ye who enter here 👋
-    #
-    # Mypy still does not support `__class_getitem__`, although it was introduced in Python 3.7:
-    # https://github.com/python/mypy/issues/11501.
-    # This line allows to treat `Payload[T]` simply as `T` itself, that is consistent
-    # with `Annotated[T, Payload()]` annotation.
-    Payload: TypeAlias = _T
+    def __class_getitem__(cls, item: type[Any]) -> Any:
+        raise NotImplementedError("the shortcut is no longer supported, use `Annotated[..., Payload()]`")
 
 
 @dataclass(**SLOTS)
@@ -216,36 +198,28 @@ def __call__(self, request: ContainsPayload, value: Any) -> None:  # noqa: D102
         request.payload[self.name] = value.value if isinstance(value, Enum) else value
 
 
-if not TYPE_CHECKING:
-
-    @dataclass(**SLOTS)
-    class FormData(ParameterMarker[ContainsFormData]):
-        """
-        Mark parameter as a request form data.
-
-        An argument gets converted to a dictionary and passed over to a backend.
-
-        Examples:
-            >>> def call(body: FormData[FormModel]) -> ...:
-            >>>     ...
-
-            >>> def call(body: Annotated[FormModel, FormData()]) -> ...:
-            >>>     ...
-        """
+@dataclass(**SLOTS)
+class FormData(ParameterMarker[ContainsFormData]):
+    """
+    Mark parameter as a request form data.
 
-        @override
-        def __call__(self, request: ContainsFormData, value: Any) -> None:  # noqa: D102
-            value = get_type_adapter(type(value)).dump_python(value, by_alias=True)
-            if not isinstance(value, dict):
-                raise TypeError(f"form data requires a dictionary, got {type(value)}")
-            for item_name, item_value in value.items():
-                request.append_form_field(item_name, item_value)
+    An argument gets converted to a dictionary and passed over to a backend.
 
-        def __class_getitem__(cls, item: type[Any]) -> Any:
-            return Annotated[item, FormData()]
+    Examples:
+        >>> def call(body: Annotated[FormModel, FormData()]) -> ...:
+        >>>     ...
+    """
 
-else:
-    FormData: TypeAlias = _T
+    @override
+    def __call__(self, request: ContainsFormData, value: Any) -> None:  # noqa: D102
+        value = get_type_adapter(type(value)).dump_python(value, by_alias=True)
+        if not isinstance(value, dict):
+            raise TypeError(f"form data requires a dictionary, got {type(value)}")
+        for item_name, item_value in value.items():
+            request.append_form_field(item_name, item_value)
+
+    def __class_getitem__(cls, item: type[Any]) -> Any:
+        raise NotImplementedError("the shortcut is no longer supported, use `Annotated[..., FormData()]`")
 
 
 @dataclass(**SLOTS)
diff --git a/combadge/support/soap/markers.py b/combadge/support/soap/markers.py
index 44a30b8..008cb11 100644
--- a/combadge/support/soap/markers.py
+++ b/combadge/support/soap/markers.py
@@ -2,7 +2,7 @@
 from inspect import BoundArguments
 from typing import TYPE_CHECKING, Annotated, Any, Callable, Generic, TypeVar
 
-from typing_extensions import TypeAlias, override
+from typing_extensions import TypeAlias, override, TypeAliasType
 
 from combadge._helpers.dataclasses import SLOTS
 from combadge._helpers.pydantic import get_type_adapter
@@ -39,46 +39,34 @@ def operation_name(name: str) -> Callable[[FunctionT], FunctionT]:
     return OperationName[Any](name).mark
 
 
-if not TYPE_CHECKING:
-
-    @dataclass(**SLOTS)
-    class Header(ParameterMarker[ContainsSoapHeader]):
-        """
-        Mark parameter as a request header.
-
-        An argument gets converted to a dictionary and passed over to a backend.
-
-        Examples:
-            Simple usage:
-
-            >>> def call(body: Header[HeaderModel]) -> ...:
-            >>>     ...
-
-            Equivalent expanded usage:
-
-            >>> def call(body: Annotated[HeaderModel, Header()]) -> ...:
-            >>>     ...
-        """
+@dataclass(**SLOTS)
+class Header(ParameterMarker[ContainsSoapHeader]):
+    """
+    Mark parameter as a request header.
 
-        exclude_unset: bool = False
-        by_alias: bool = False
+    An argument gets converted to a dictionary and passed over to a backend.
 
-        @override
-        def __call__(self, request: ContainsSoapHeader, value: Any) -> None:  # noqa: D102
-            value = get_type_adapter(type(value)).dump_python(
-                value,
-                by_alias=self.by_alias,
-                exclude_unset=self.exclude_unset,
-            )
-            if request.soap_header is None:
-                request.soap_header = value
-            elif isinstance(request.soap_header, dict):
-                request.soap_header.update(value)  # merge into the existing header
-            else:
-                raise ValueError(f"attempting to merge `{type(value)}` into `{type(request.soap_header)}`")
+    Examples:
+        >>> def call(body: Annotated[HeaderModel, Header()]) -> ...:
+        >>>     ...
+    """
 
-        def __class_getitem__(cls, item: type[Any]) -> Any:
-            return Annotated[item, cls()]
+    exclude_unset: bool = False
+    by_alias: bool = False
 
-else:
-    FormData: TypeAlias = _T
+    @override
+    def __call__(self, request: ContainsSoapHeader, value: Any) -> None:  # noqa: D102
+        value = get_type_adapter(type(value)).dump_python(
+            value,
+            by_alias=self.by_alias,
+            exclude_unset=self.exclude_unset,
+        )
+        if request.soap_header is None:
+            request.soap_header = value
+        elif isinstance(request.soap_header, dict):
+            request.soap_header.update(value)  # merge into the existing header
+        else:
+            raise ValueError(f"attempting to merge `{type(value)}` into `{type(request.soap_header)}`")
+
+    def __class_getitem__(cls, item: type[Any]) -> Any:
+        raise NotImplementedError("the shortcut is no longer supported, use `Annotated[..., Header()]`")
diff --git a/docs/support/models/index.md b/docs/support/models/index.md
index a47a85c..123a5e5 100644
--- a/docs/support/models/index.md
+++ b/docs/support/models/index.md
@@ -18,7 +18,7 @@ from httpx import Client
 class Httpbin(Protocol):
     @http_method("POST")
     @path("/anything")
-    def post_anything(self, foo: Payload[int]) -> Annotated[int, Extract("data")]:
+    def post_anything(self, foo: Annotated[int, Payload()]) -> Annotated[int, Extract("data")]:
         ...
 
 
@@ -31,7 +31,7 @@ assert backend[Httpbin].post_anything(42) == 42
 ```python title="dataclasses.py" hl_lines="10-12 15-17 23 28"
 from dataclasses import dataclass
 
-from typing_extensions import Protocol
+from typing_extensions import Protocol, Annotated
 
 from combadge.support.httpx.backends.sync import HttpxBackend
 from combadge.support.http.markers import Payload, http_method, path
@@ -51,7 +51,7 @@ class Response:
 class Httpbin(Protocol):
     @http_method("POST")
     @path("/anything")
-    def post_anything(self, foo: Payload[Request]) -> Response:
+    def post_anything(self, foo: Annotated[Request, Payload()]) -> Response:
         ...
 
 
@@ -62,7 +62,7 @@ assert backend[Httpbin].post_anything(Request(42)) == Response(data='{"foo": 42}
 ## [Typed dictionaries](https://docs.python.org/3/library/typing.html#typing.TypedDict)
 
 ```python title="typed_dict.py" hl_lines="8-9 12-13 19 24"
-from typing_extensions import Protocol, TypedDict
+from typing_extensions import Protocol, TypedDict, Annotated
 
 from combadge.support.httpx.backends.sync import HttpxBackend
 from combadge.support.http.markers import Payload, http_method, path
@@ -80,7 +80,7 @@ class Response(TypedDict):
 class Httpbin(Protocol):
     @http_method("POST")
     @path("/anything")
-    def post_anything(self, foo: Payload[Request]) -> Response:
+    def post_anything(self, foo: Annotated[Request, Payload()]) -> Response:
         ...
 
 
diff --git a/tests/core/markers/test_parameter.py b/tests/core/markers/test_parameter.py
index e7ba328..d51ccf5 100644
--- a/tests/core/markers/test_parameter.py
+++ b/tests/core/markers/test_parameter.py
@@ -3,14 +3,13 @@
 import pytest
 
 from combadge.core.markers.parameter import ParameterMarker
-from combadge.support.http.markers import CustomHeader, Payload
+from combadge.support.http.markers import CustomHeader
 
 
 @pytest.mark.parametrize(
     ("type_", "expected"),
     [
         (int, []),
-        (Payload[int], [Payload()]),
         (Annotated[str, CustomHeader("X-Header")], [CustomHeader("X-Header")]),
     ],
 )
diff --git a/tests/integration/test_httpbin.py b/tests/integration/test_httpbin.py
index 6bcf40a..4528581 100644
--- a/tests/integration/test_httpbin.py
+++ b/tests/integration/test_httpbin.py
@@ -36,7 +36,7 @@ class SupportsHttpbin(SupportsService, Protocol):
         @abstractmethod
         def post_anything(
             self,
-            data: FormData[Data],
+            data: Annotated[Data, FormData()],
             bar: Annotated[int, FormField("barqux")],
             qux: Annotated[int, FormField("barqux")],
         ) -> Response: ...