diff --git a/examples/get_test_entities.py b/examples/get_test_entities.py
index 1a4037a..1b36c77 100644
--- a/examples/get_test_entities.py
+++ b/examples/get_test_entities.py
@@ -19,31 +19,38 @@ async def main() -> None:
         oauth_token=API_TOKEN,
     )
 
-    # requests for tests
-    me = await client.get_myself()
-    await client.get_user(uid=me.uid)
-    await client.get_users()
-    await client.get_issue('TRACKER-1')
-    await client.get_issue('TRACKER-1', expand='transitions')
-    await client.get_issue('TRACKER-1', expand='attachments')
-    await client.get_issue_transitions('TRACKER-1')
-    await client.get_queue('TRACKER')
-    await client.get_queue_fields('TRACKER')
-    await client.get_queue_versions('TRACKER')
-    await client.get_issue_relationships('TRACKER-1')
-    await client.get_checklist_items("TRACKER-1")
-    await client.get_components()
-    await client.get_worklog("TRACKER-1")
-    await client.get_worklog_records_by_parameters(me.login)
-    await client.get_attachments_list('TRACKER-1')
-    await client.get_issue_comments('TRACKER-1')
-    await client.get_projects_list(expand='queues')
-    await client.get_external_applications()
-    await client.get_external_links("TRACKER-1")
-    await client.get_macros('TRACKER')
-    await client.find_number_of_issues(issue_filter={'queue': 'TRACKER', "assignee": "empty()"})
-    await client.get_history_issue_changes('TRACKER-1')
-    await client.find_issues()
+
+    try:
+        # requests for tests
+        me = await client.get_myself()
+        await client.get_user(uid=me.uid)
+        await client.get_users()
+        await client.get_issue('TRACKER-1')
+        await client.get_issue('TRACKER-1', expand='transitions')
+        await client.get_issue('TRACKER-1', expand='attachments')
+        await client.get_issue_transitions('TRACKER-1')
+        await client.get_queue('TRACKER')
+        await client.get_queue_fields('TRACKER')
+        await client.get_queue_versions('TRACKER')
+        await client.get_issue_relationships('TRACKER-1')
+        await client.get_checklist_items("TRACKER-1")
+        await client.get_components()
+        await client.get_worklog("TRACKER-1")
+        await client.get_worklog_records_by_parameters(me.login)
+        await client.get_attachments_list('TRACKER-1')
+        await client.get_issue_comments('TRACKER-1')
+        await client.get_projects_list(expand='queues')
+        await client.get_external_applications()
+        await client.get_external_links("TRACKER-1")
+        await client.get_macros('TRACKER')
+        await client.find_number_of_issues(issue_filter={'queue': 'TRACKER', "assignee": "empty()"})
+        await client.get_history_issue_changes('TRACKER-1')
+        await client.find_issues()
+    except Exception as e:
+        print('Test failed')
+        print(e)
+    else:
+        print('Test passed')
 
     await client.stop()
 
diff --git a/ya_tracker_client/domain/repositories/bulk_operation.py b/ya_tracker_client/domain/repositories/bulk_operation.py
index ee52a85..ba7fa5c 100644
--- a/ya_tracker_client/domain/repositories/bulk_operation.py
+++ b/ya_tracker_client/domain/repositories/bulk_operation.py
@@ -25,7 +25,7 @@ async def bulk_move_issues(
                 move_all_fields=move_all_fields,
                 initial_status=initial_status,
             ).model_dump(exclude_none=True, by_alias=True),
-            params={"notify": "true" if notify else "false"},
+            params={"notify": str(notify).lower()},
         )
         return self._decode(raw_response, BulkOperation)
 
@@ -45,7 +45,7 @@ async def bulk_change_issues(
                 issues=issue_ids,
                 values=values,
             ).model_dump(exclude_none=True, by_alias=True),
-            params={"notify": "true" if notify else "false"},
+            params={"notify": str(notify).lower()},
         )
         return self._decode(raw_response, BulkOperation)
 
@@ -67,6 +67,6 @@ async def bulk_change_issues_statuses(
                 issues=issue_ids,
                 values=values,
             ).model_dump(exclude_none=True, by_alias=True),
-            params={"notify": "true" if notify else "false"},
+            params={"notify": str(notify).lower()},
         )
         return self._decode(raw_response, BulkOperation)
diff --git a/ya_tracker_client/domain/repositories/comment.py b/ya_tracker_client/domain/repositories/comment.py
index 0feda15..454d321 100644
--- a/ya_tracker_client/domain/repositories/comment.py
+++ b/ya_tracker_client/domain/repositories/comment.py
@@ -11,7 +11,7 @@ async def add_comment(
         attachment_ids: list[str] | None = None,
         summonees: list[str | UserShort] | None = None,
         maillist_summonees: list[str] | None = None,
-        is_add_to_followers: bool | None = None,
+        is_add_to_followers: bool = True,
     ) -> Comment:
         """
         Use this method to add a comment to an issue.
@@ -27,7 +27,7 @@ async def add_comment(
                 summonees=summonees,
                 maillist_summonees=maillist_summonees,
             ).model_dump(exclude_none=True, by_alias=True),
-            params={"is_add_to_followers": is_add_to_followers} if is_add_to_followers is not None else None,
+            params={"is_add_to_followers": str(is_add_to_followers).lower()}
         )
         return self._decode(raw_response, Comment)
 
diff --git a/ya_tracker_client/domain/repositories/external_link.py b/ya_tracker_client/domain/repositories/external_link.py
index 6b75aa5..622b198 100644
--- a/ya_tracker_client/domain/repositories/external_link.py
+++ b/ya_tracker_client/domain/repositories/external_link.py
@@ -30,7 +30,7 @@ async def add_external_link(
         key: str,
         origin: str,
         relationship: str = "RELATES",
-        backlink: bool | None = None,
+        backlink: bool = False,
     ) -> ExternalLink:
         """
         YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/add-external-link
@@ -43,7 +43,7 @@ async def add_external_link(
                 "origin": origin,
                 "relationship": relationship,
             },
-            params={"backlink": backlink} if backlink is not None else None,
+            params={"backlink": str(backlink).lower()},
         )
         return self._decode(raw_response, ExternalLink)
 
diff --git a/ya_tracker_client/domain/repositories/issue.py b/ya_tracker_client/domain/repositories/issue.py
index 82262bf..c0996bb 100644
--- a/ya_tracker_client/domain/repositories/issue.py
+++ b/ya_tracker_client/domain/repositories/issue.py
@@ -86,7 +86,7 @@ async def get_priorities(
         raw_response = await self._client.request(
             method="GET",
             uri="/priorities/",
-            params={"localized": str(localized)},
+            params={"localized": str(localized).lower()},
         )
         return self._decode(raw_response, Priority)
 
@@ -147,10 +147,10 @@ async def move_issue_to_another_queue(
             uri=f"/issues/{issue_id}/_move",
             params={
                 "queue": queue_id,
-                "notify": str(notify),
-                "notifyAuthor": str(notify_author),
-                "moveAllFields": str(move_all_fields),
-                "initialStatus": str(initial_status),
+                "notify": str(notify).lower(),
+                "notifyAuthor": str(notify_author).lower(),
+                "moveAllFields": str(move_all_fields).lower(),
+                "initialStatus": str(initial_status).lower(),
                 "expand": expand or "",
             },
             payload=IssueEdit(**kwargs).model_dump(exclude_unset=True),