diff --git a/.gitignore b/.gitignore
index 789754b..3565a84 100644
--- a/.gitignore
+++ b/.gitignore
@@ -107,6 +107,7 @@ crashlytics.properties
 crashlytics-build.properties
 
 .pytest_cache/
+.mypy_cache/
 .python-version
 venv/
 
diff --git a/.travis.yml b/.travis.yml
index a4e1c89..87c4597 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,24 @@
 language: python
 sudo: false
-python:
-- pypy
-- 2.7
-- 3.4
-- 3.5
-- 3.6
+jobs:
+  includes:
+  - python: pypy
+    env: RUN_MYPY=false
+  - python: 2.7
+    env: RUN_MYPY=false
+  - python: 3.4
+    env: RUN_MYPY=false
+  - python: 3.5
+    env: RUN_MYPY=true
+  - python: 3.6
+    env: RUN_MYPY=true
 install:
 - pip install tox-travis flake8 collective.checkdocs Pygments
+- $RUN_MYPY && pip install mypy || true
 script:
 - flake8 .
 - python setup.py checkdocs
 - tox
+- $RUN_MYPY && mypy iamport || true
 after_success:
 - bash <(curl -s https://codecov.io/bash)
diff --git a/iamport/client.pyi b/iamport/client.pyi
new file mode 100644
index 0000000..995f248
--- /dev/null
+++ b/iamport/client.pyi
@@ -0,0 +1,66 @@
+from typing import Any, Dict, Optional, Union
+
+import requests
+
+IAMPORT_API_URL: str = ...
+Amount = Union[int, float]
+
+class Iamport(object):
+    requests_session: requests.Session
+
+    def __init__(self, imp_key: str, imp_secret: str, imp_url: str = ...) -> None: ...
+
+    class ResponseError(Exception):
+        code: Any
+        message: Any
+        def __init__(self, code: Optional[Any] = ..., message: Optional[Any] = ...) -> None: ...
+
+    class HttpError(Exception):
+        code: Any
+        message: Any
+        def __init__(self, code: Optional[Any] = ..., message: Optional[Any] = ...) -> None: ...
+
+    @staticmethod
+    def get_response(response: requests.Response) -> Dict: ...
+
+    def _get_token(self) -> str: ...
+
+    def get_headers(self) -> Dict[str, str]: ...
+
+    def _get(self, url: str, payload: Optional[Dict[str, Any]] = ...) -> Dict: ...
+
+    def _post(self, url: str, payload: Optional[Dict[str, Any]] = ...) -> Dict: ...
+
+    def find_by_merchant_uid(self, merchant_uid: str) -> Dict: ...
+
+    def find_by_imp_uid(self, imp_uid: str) -> Dict: ...
+
+    def find(self, **kwargs) -> Dict: ...
+
+    def _cancel(self, payload: Dict[str, Any]) -> Dict: ...
+
+    def pay_onetime(self, **kwargs) -> Dict: ...
+
+    def pay_again(self, **kwargs) -> Dict: ...
+
+    def customer_create(self, **kwargs) -> Dict: ...
+
+    def customer_get(self, customer_uid: str) -> Dict: ...
+
+    def pay_foreign(self, **kwargs) -> Dict: ...
+
+    def pay_schedule(self, **kwargs) -> Dict: ...
+
+    def pay_unschedule(self, **kwargs) -> Dict: ...
+
+    def cancel_by_merchant_uid(self, merchant_uid: str, reason: str, **kwargs) -> Dict: ...
+
+    def cancel_by_imp_uid(self, imp_uid: str, reason: str, **kwargs) -> Dict: ...
+
+    def cancel(self, reason: str, **kwargs) -> Dict: ...
+
+    def is_paid(self, amount: Amount, **kwargs) -> bool: ...
+
+    def prepare(self, merchant_uid: str, amount: Amount) -> Dict: ...
+
+    def prepare_validate(self, merchant_uid: str, amount: Amount) -> Dict: ...
diff --git a/setup.py b/setup.py
index d31c939..09a5eca 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,28 @@ def readme():
     long_description=readme(),
     license='MIT',
     zip_safe=False,
+    data_files=[
+        (
+            'shared/typehints/python2.7',
+            ['iamport/client.pyi'],
+        ),
+        (
+            'shared/typehints/python3.5',
+            ['iamport/client.pyi'],
+        ),
+        (
+            'shared/typehints/python3.6',
+            ['iamport/client.pyi'],
+        ),
+        (
+            'shared/typehints/python3.7',
+            ['iamport/client.pyi'],
+        ),
+        (
+            'shared/typehints/python3.8',
+            ['iamport/client.pyi'],
+        ),
+    ],
     classifiers=[
         'Development Status :: 2 - Pre-Alpha',
         'Environment :: Web Environment',