diff --git a/iamport/client.py b/iamport/client.py
index 2ec4048..7b0087d 100644
--- a/iamport/client.py
+++ b/iamport/client.py
@@ -68,14 +68,16 @@ def _post(self, url, payload=None):
         )
         return self.get_response(response)
 
-    def _delete(self, url):
+    def _delete(self, url, payload=None):
         headers = self.get_headers()
-        response = self.requests_session.delete(url, headers=headers)
+        response = self.requests_session.delete(
+            url, headers=headers, params=payload
+        )
         return self.get_response(response)
 
-    def find_by_status(self, status, **params):
+    def find_by_status(self, status, **kwargs):
         url = '{}payments/status/{}'.format(self.imp_url, status)
-        return self._get(url, params=params)
+        return self._get(url, kwargs)
 
     def find_by_merchant_uid(self, merchant_uid, status=None):
         url = '{}payments/find/{}'.format(self.imp_url, merchant_uid)
@@ -132,9 +134,9 @@ def customer_get(self, customer_uid):
         url = '{}subscribe/customers/{}'.format(self.imp_url, customer_uid)
         return self._get(url)
 
-    def customer_delete(self, customer_uid):
+    def customer_delete(self, customer_uid, **kwargs):
         url = '{}subscribe/customers/{}'.format(self.imp_url, customer_uid)
-        return self._delete(url)
+        return self._delete(url, kwargs)
 
     def pay_foreign(self, **kwargs):
         url = '{}subscribe/payments/foreign'.format(self.imp_url)
diff --git a/iamport/client.pyi b/iamport/client.pyi
index a26d76a..de06596 100644
--- a/iamport/client.pyi
+++ b/iamport/client.pyi
@@ -31,9 +31,9 @@ class Iamport(object):
 
     def _post(self, url: str, payload: Optional[Dict[str, Any]] = ...) -> Dict: ...
 
-    def _delete(self, url: str) -> Dict: ...
+    def _delete(self, url: str, payload: Optional[Dict[str, Any]] = ...) -> Dict: ...
 
-    def find_by_status(self, status: str, **params) -> Dict: ...
+    def find_by_status(self, status: str, **kwargs) -> Dict: ...
 
     def find_by_merchant_uid(self, merchant_uid: str) -> Dict: ...
 
@@ -51,7 +51,7 @@ class Iamport(object):
 
     def customer_get(self, customer_uid: str) -> Dict: ...
 
-    def customer_delete(self, customer_uid: str) -> Dict: ...
+    def customer_delete(self, customer_uid: str, **kwargs) -> Dict: ...
 
     def pay_foreign(self, **kwargs) -> Dict: ...