diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index ebc2147..f7b7720 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -152,7 +152,7 @@ def account_user(account,account_user_params) -> AccountUser:
 @pytest.fixture(scope='module')
 def service_plan_params() -> dict:
     suffix = get_suffix()
-    return {"name":f'test-{suffix}'}
+    return {"name":f'test-{suffix}', "approval_required": True}
 
 @pytest.fixture(scope='module')
 def service_plan(service, service_plan_params) -> ServicePlan:
diff --git a/tests/integration/test_integration_service_subscriptions.py b/tests/integration/test_integration_service_subscriptions.py
index e2c9a5a..5e07441 100644
--- a/tests/integration/test_integration_service_subscriptions.py
+++ b/tests/integration/test_integration_service_subscriptions.py
@@ -1,5 +1,4 @@
 
-
 from tests.integration import asserts
 
 def test_list_service_subscriptions(account):
@@ -14,3 +13,18 @@ def test_read_service_subscription(account, service_subscription, service_subscr
     resource = account.service_subscriptions.read(service_subscription.entity_id)
     asserts.assert_resource(resource)
     asserts.assert_resource_params(service_subscription,service_subscription_params)
+
+def test_change_plan_service_subscription(account, account_plan, service_plan,
+                                          service_subscription):
+    asserts.assert_resource(account)
+    asserts.assert_resource(account_plan)
+    asserts.assert_resource(service_plan)
+    account.service_subscriptions.change_plan(service_subscription.entity_id,
+                                                         service_plan.entity_id)
+
+def test_approve_service_subscription(account, service_subscription, service_plan):
+    asserts.assert_resource(service_subscription)
+    asserts.assert_resource(account)
+    asserts.assert_resource(service_plan)
+    resource = service_subscription.approve()
+    asserts.assert_resource(resource)
diff --git a/threescale_api/resources.py b/threescale_api/resources.py
index 8306e0e..357e9b5 100644
--- a/threescale_api/resources.py
+++ b/threescale_api/resources.py
@@ -286,14 +286,14 @@ def url(self) -> str:
         return self.parent.url + '/service_subscriptions'
 
     def approve(self, entity_id: int, **kwargs):
-        url = self.url + f"/{entity_id}/approve.json"
+        url = self.url + f"/{entity_id}/approve"
         response = self.rest.put(url=url, **kwargs)
-        instance = utils.extract_response(response=response)
+        instance = self._create_instance(response=response)
         return instance
 
     def change_plan(self, entity_id: int, plan_id: int, **kwargs):
         params = {"plan_id": plan_id}
-        url = self.url + f"/{entity_id}/change_plan.json"
+        url = self.url + f"/{entity_id}/change_plan"
         response = self.rest.put(url=url, json=params, **kwargs)
         instance = utils.extract_response(response=response)
         return instance