diff --git a/ya_tracker_client/domain/client/base.py b/ya_tracker_client/domain/client/base.py
index ac19adf..b9b270e 100644
--- a/ya_tracker_client/domain/client/base.py
+++ b/ya_tracker_client/domain/client/base.py
@@ -1,6 +1,5 @@
 from abc import ABC, abstractmethod
 from http import HTTPStatus
-from json import dumps
 from logging import getLogger
 from typing import Any
 
@@ -14,6 +13,7 @@
     ClientObjectNotFoundError,
     ClientSufficientRightsError,
 )
+from ya_tracker_client.utils import serialize_entity
 
 
 logger = getLogger(__name__)
@@ -60,7 +60,7 @@ async def request(
         uri = f"{self._base_url}/{self._api_version}{uri}"
 
         bytes_payload = BytesPayload(
-            value=bytes(dumps(payload), encoding="utf-8"),
+            value=bytes(serialize_entity(payload), encoding="utf-8"),
             content_type="application/json",
         )
 
diff --git a/ya_tracker_client/domain/entities/base.py b/ya_tracker_client/domain/entities/base.py
index 011640c..5642f5b 100644
--- a/ya_tracker_client/domain/entities/base.py
+++ b/ya_tracker_client/domain/entities/base.py
@@ -1,7 +1,15 @@
 from abc import ABCMeta
 
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
+from pydantic.alias_generators import to_camel
+
+
+def tracker_alias_generator(s: str) -> str:
+    """Convert a string from snake case to camel case and rename url to self"""
+    if s == "url":
+        return "self"
+    return to_camel(s)
 
 
 class AbstractEntity(BaseModel, metaclass=ABCMeta):
-    ...
+    model_config = ConfigDict(alias_generator=tracker_alias_generator, populate_by_name=True)
diff --git a/ya_tracker_client/domain/entities/checklist.py b/ya_tracker_client/domain/entities/checklist.py
new file mode 100644
index 0000000..3188caf
--- /dev/null
+++ b/ya_tracker_client/domain/entities/checklist.py
@@ -0,0 +1,28 @@
+
+from ya_tracker_client.domain.entities.base import AbstractEntity
+from ya_tracker_client.domain.entities.deadline import Deadline
+from ya_tracker_client.domain.entities.user import UserShort
+
+
+class ChecklistCreate(AbstractEntity):
+    text: str
+    checked: bool | None = None
+    assignee: str | None = None
+    deadline: Deadline | None = None
+
+
+class ChecklistItem(AbstractEntity):
+    id: str
+    text: str
+    text_html: str
+    checked: bool
+    checklist_item_type: str
+    deadline: Deadline | None = None
+    assignee: UserShort | None = None
+
+
+class ChecklistItemEdit(AbstractEntity):
+    text: str
+    checked: bool | None = None
+    assignee: str | None = None
+    deadline: Deadline | None = None
diff --git a/ya_tracker_client/domain/entities/deadline.py b/ya_tracker_client/domain/entities/deadline.py
new file mode 100644
index 0000000..f74a5ed
--- /dev/null
+++ b/ya_tracker_client/domain/entities/deadline.py
@@ -0,0 +1,9 @@
+from datetime import datetime
+
+from ya_tracker_client.domain.entities.base import AbstractEntity
+
+
+class Deadline(AbstractEntity):
+    date: datetime
+    deadline_type: str = "date"
+    is_exceeded: bool | None = None
diff --git a/ya_tracker_client/domain/entities/issue.py b/ya_tracker_client/domain/entities/issue.py
index 7f314be..6638026 100644
--- a/ya_tracker_client/domain/entities/issue.py
+++ b/ya_tracker_client/domain/entities/issue.py
@@ -1,8 +1,10 @@
 from datetime import datetime
 
-from pydantic import AliasChoices, Field
+from pydantic import Field
 
 from ya_tracker_client.domain.entities.base import AbstractEntity
+from ya_tracker_client.domain.entities.checklist import ChecklistItem
+from ya_tracker_client.domain.entities.issue_status import IssueStatus
 from ya_tracker_client.domain.entities.issue_type import IssueType
 from ya_tracker_client.domain.entities.priority import Priority
 from ya_tracker_client.domain.entities.queue import QueueIdentifier, QueueShort
@@ -12,14 +14,14 @@
 
 
 class IssueShort(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
 
 
 class Issue(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     version: int
@@ -39,8 +41,8 @@ class Issue(AbstractEntity):
     last_comment_update_at: datetime | None = None
     aliases: list[str] | None = None
     updated_by: UserShort | None = None
-    created_at: datetime = Field(validation_alias=AliasChoices("createdAt", "created_at"))
-    created_by: UserShort = Field(validation_alias=AliasChoices("createdBy", "created_by"))
+    created_at: datetime
+    created_by: UserShort
     votes: int
     updated_at: datetime | None = None
     status: Status
@@ -59,10 +61,7 @@ class IssueCreate(AbstractEntity):
     followers: list[UserShort | str] | None = None
     assignee: list[UserShort | str] | None = None
     unique: str | None = None
-    attachment_ids: list[str] | None = Field(
-        default=None,
-        validation_alias=AliasChoices("attachmentIds", "attachment_ids"),
-    )
+    attachment_ids: list[str] | None = None
 
 
 class IssueEdit(AbstractEntity):
@@ -73,3 +72,34 @@ class IssueEdit(AbstractEntity):
     type: IssueType | None = None
     priority: Priority | None = None
     followers: list[UserShort | str] | None = None
+
+
+class IssueWithChecklist(AbstractEntity):
+    url: str
+    id: str
+    key: str
+    version: int
+
+    summary: str
+    description: str | None = None
+    type: IssueType
+    priority: Priority
+    followers: list[UserShort] | None = None
+    queue: QueueShort
+    favorite: bool
+    assignee: UserShort | None = None
+
+    last_comment_updated_at: datetime | None = None
+    pending_reply_from: UserShort | None = None
+    created_at: datetime
+    updated_at: datetime
+    created_by: UserShort
+    updated_by: UserShort | None = None
+    votes: int
+    status: IssueStatus
+    previous_status: IssueStatus | None = None
+    status_start_time: datetime
+    previous_status_last_assignee: UserShort | None = None
+    deadline: datetime | None = None
+
+    checklist_items: list[ChecklistItem] = Field(default_factory=list)
diff --git a/ya_tracker_client/domain/entities/issue_relationship.py b/ya_tracker_client/domain/entities/issue_relationship.py
index 57c126c..9328685 100644
--- a/ya_tracker_client/domain/entities/issue_relationship.py
+++ b/ya_tracker_client/domain/entities/issue_relationship.py
@@ -1,8 +1,6 @@
 from datetime import datetime
 from enum import Enum
 
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 from ya_tracker_client.domain.entities.issue import IssueShort
 from ya_tracker_client.domain.entities.issue_status import IssueStatus
@@ -22,22 +20,22 @@ class IssueRelationshipTypeEnum(str, Enum):
 
 
 class IssueRelationshipType(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     inward: str
     outward: str
 
 
 class IssueRelationship(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: int
     type: IssueRelationshipType
     direction: str
     object: IssueShort
-    created_at: datetime = Field(validation_alias=AliasChoices("createdAt", "created_at"))
-    updated_at: datetime = Field(validation_alias=AliasChoices("updatedAt", "updated_at"))
-    created_by: UserShort = Field(validation_alias=AliasChoices("createdBy", "created_by"))
-    updated_by: UserShort = Field(validation_alias=AliasChoices("updatedBy", "updated_by"))
+    created_at: datetime
+    updated_at: datetime
+    created_by: UserShort
+    updated_by: UserShort
     assignee: UserShort | None = None
     status: IssueStatus
 
diff --git a/ya_tracker_client/domain/entities/issue_status.py b/ya_tracker_client/domain/entities/issue_status.py
index a11c981..5e1d7f4 100644
--- a/ya_tracker_client/domain/entities/issue_status.py
+++ b/ya_tracker_client/domain/entities/issue_status.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class IssueStatus(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
diff --git a/ya_tracker_client/domain/entities/issue_type.py b/ya_tracker_client/domain/entities/issue_type.py
index 9158600..0e7ddf2 100644
--- a/ya_tracker_client/domain/entities/issue_type.py
+++ b/ya_tracker_client/domain/entities/issue_type.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class IssueType(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
diff --git a/ya_tracker_client/domain/entities/issue_type_config.py b/ya_tracker_client/domain/entities/issue_type_config.py
index e502371..7c1461c 100644
--- a/ya_tracker_client/domain/entities/issue_type_config.py
+++ b/ya_tracker_client/domain/entities/issue_type_config.py
@@ -1,5 +1,3 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 from ya_tracker_client.domain.entities.issue_type import IssueType
 from ya_tracker_client.domain.entities.resolution import ResolutionShort
@@ -7,6 +5,6 @@
 
 
 class IssueTypeConfig(AbstractEntity):
-    issue_type: IssueType = Field(validation_alias=AliasChoices("issueType", "issue_type"))
+    issue_type: IssueType
     workflow: WorkflowShort
     resolutions: list[ResolutionShort]
diff --git a/ya_tracker_client/domain/entities/priority.py b/ya_tracker_client/domain/entities/priority.py
index 41457b9..9a7ae37 100644
--- a/ya_tracker_client/domain/entities/priority.py
+++ b/ya_tracker_client/domain/entities/priority.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class Priority(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: int
     key: str
     display: str | None = None
diff --git a/ya_tracker_client/domain/entities/queue.py b/ya_tracker_client/domain/entities/queue.py
index 2885193..75f946a 100644
--- a/ya_tracker_client/domain/entities/queue.py
+++ b/ya_tracker_client/domain/entities/queue.py
@@ -1,4 +1,4 @@
-from pydantic import AliasChoices, Field
+from pydantic import Field
 
 from ya_tracker_client.domain.entities.base import AbstractEntity
 from ya_tracker_client.domain.entities.issue_type import IssueType
@@ -14,55 +14,42 @@ class QueueIdentifier(AbstractEntity):
 
 
 class QueueShort(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
 
 
 class QueueVersion(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     display: str
 
 
 class Queue(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: int
     key: str
     version: int
     name: str
     description: str | None = None  # TODO: string in documentation, but may be missing in response - TB145879
     lead: UserShort
-    assign_auto: bool = Field(validation_alias=AliasChoices("assignAuto", "assign_auto"))
-    default_type: IssueType = Field(validation_alias=AliasChoices("defaultType", "default_type"))
-    default_priority: Priority = Field(validation_alias=AliasChoices("defaultPriority", "default_priority"))
-    team_users: list[UserShort] = Field(default=list, validation_alias=AliasChoices("teamUsers", "team_users"))
-    issue_types: list[IssueType] = Field(default=list, validation_alias=AliasChoices("issueTypes", "issue_types"))
-    versions: list[QueueVersion] = Field(default=list)
-    workflows: list[WorkflowShort] = Field(default=list)
-    deny_voting: bool = Field(validation_alias=AliasChoices("denyVoting", "deny_voting"))
-    issue_types_config: list[IssueTypeConfig] = Field(
-        default=list,
-        validation_alias=AliasChoices("issueTypesConfig", "issue_types_config"),
-    )
+    assign_auto: bool
+    default_type: IssueType
+    default_priority: Priority
+    team_users: list[UserShort] = Field(default_factory=list)
+    issue_types: list[IssueType] = Field(default_factory=list)
+    versions: list[QueueVersion] = Field(default_factory=list)
+    workflows: list[WorkflowShort] = Field(default_factory=list)
+    deny_voting: bool
+    issue_types_config: list[IssueTypeConfig] = Field(default_factory=list)
 
     # TODO: documentation does not contain this fields - TB145879
-    deny_conductor_autolink: bool = Field(
-        validation_alias=AliasChoices("denyConductorAutolink", "deny_conductor_autolink"),
-    )
-    deny_tracker_auto_link: bool = Field(
-        validation_alias=AliasChoices("denyTrackerAutolink", "deny_tracker_auto_link"),
-    )
-    use_component_permissions_intersection: bool = Field(
-        validation_alias=AliasChoices("useComponentPermissionsIntersection", "use_component_permissions_intersection"),
-    )
-    workflow_actions_style: str = Field(
-        validation_alias=AliasChoices("workflowActionsStyle", "workflow_actions_style"),
-    )
-    use_last_signature: bool = Field(
-        validation_alias=AliasChoices("useLastSignature", "use_last_signature"),
-    )
+    deny_conductor_autolink: bool | None = None
+    deny_tracker_auto_link: bool | None = None
+    use_component_permissions_intersection: bool | None = None
+    workflow_actions_style: str | None = None
+    use_last_signature: bool | None = None
 
 
 class QueueCreate(AbstractEntity):
@@ -70,10 +57,5 @@ class QueueCreate(AbstractEntity):
     name: str
     lead: str
     default_type: str
-    default_priority: str = Field(
-        validation_alias=AliasChoices("defaultPriority", "default_priority"),
-    )
-    issue_types_config: list[IssueTypeConfig] = Field(
-        default=list,
-        validation_alias=AliasChoices("issueTypesConfig", "issue_types_config"),
-    )
+    default_priority: str
+    issue_types_config: list[IssueTypeConfig] = Field(default_factory=list)
diff --git a/ya_tracker_client/domain/entities/queue_field.py b/ya_tracker_client/domain/entities/queue_field.py
index c851924..03bcd01 100644
--- a/ya_tracker_client/domain/entities/queue_field.py
+++ b/ya_tracker_client/domain/entities/queue_field.py
@@ -9,7 +9,7 @@
 
 
 class QueueField(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     name: str
     version: int
@@ -19,17 +19,11 @@ class QueueField(AbstractEntity):
     readonly: bool
     options: bool
     suggest: bool
-    options_provider: QueueFieldOptionsProvider | None = Field(  # TODO: not required in response - not documented
-        default=None, validation_alias=AliasChoices("optionsProvider", "options_provider"),
-    )
-    query_provider: QueueFieldQueryProvider | None = Field(
-        default=None, validation_alias=AliasChoices("queryProvider", "query_provider"),
-    )
+    options_provider: QueueFieldOptionsProvider | None = None  # TODO: not required in response - not documented
+    query_provider: QueueFieldQueryProvider | None = None
     order: int
 
     # TODO: documentation does not contain this fields
-    suggest_provider: QueueFieldSuggestProvider | None = Field(
-        default=None, validation_alias=AliasChoices("suggestProvider", "suggest_provider"),
-    )
+    suggest_provider: QueueFieldSuggestProvider | None = None
     type: str
     category: QueueFieldCategory
diff --git a/ya_tracker_client/domain/entities/queue_field_category.py b/ya_tracker_client/domain/entities/queue_field_category.py
index 554f9a9..4382823 100644
--- a/ya_tracker_client/domain/entities/queue_field_category.py
+++ b/ya_tracker_client/domain/entities/queue_field_category.py
@@ -1,9 +1,7 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class QueueFieldCategory(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     display: str
diff --git a/ya_tracker_client/domain/entities/queue_version.py b/ya_tracker_client/domain/entities/queue_version.py
index b191003..8eb0204 100644
--- a/ya_tracker_client/domain/entities/queue_version.py
+++ b/ya_tracker_client/domain/entities/queue_version.py
@@ -1,19 +1,17 @@
 from datetime import date
 
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 from ya_tracker_client.domain.entities.queue import QueueShort
 
 
 class QueueVersion(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: int
     version: int
     queue: QueueShort
     name: str
     description: str | None = None  # TODO: string in documentation, but may be missing in response - TB145879
-    start_date: date | None = Field(default=None, validation_alias=AliasChoices("startDate", "start_date"))
-    due_date: date | None = Field(default=None, validation_alias=AliasChoices("dueDate", "due_date"))
+    start_date: date | None = None
+    due_date: date | None = None
     released: bool
     archived: bool
diff --git a/ya_tracker_client/domain/entities/resolution.py b/ya_tracker_client/domain/entities/resolution.py
index 4855cac..eaacbcc 100644
--- a/ya_tracker_client/domain/entities/resolution.py
+++ b/ya_tracker_client/domain/entities/resolution.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class ResolutionShort(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
diff --git a/ya_tracker_client/domain/entities/sprint.py b/ya_tracker_client/domain/entities/sprint.py
index 24c55b4..dfc48df 100644
--- a/ya_tracker_client/domain/entities/sprint.py
+++ b/ya_tracker_client/domain/entities/sprint.py
@@ -1,9 +1,7 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class Sprint(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     display: str
diff --git a/ya_tracker_client/domain/entities/status.py b/ya_tracker_client/domain/entities/status.py
index fd53a16..86b73fe 100644
--- a/ya_tracker_client/domain/entities/status.py
+++ b/ya_tracker_client/domain/entities/status.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class Status(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
diff --git a/ya_tracker_client/domain/entities/transition.py b/ya_tracker_client/domain/entities/transition.py
index 43b3519..b63401f 100644
--- a/ya_tracker_client/domain/entities/transition.py
+++ b/ya_tracker_client/domain/entities/transition.py
@@ -1,11 +1,9 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 from ya_tracker_client.domain.entities.issue_status import IssueStatus
 
 
 class Transition(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     to: IssueStatus
     display: str
diff --git a/ya_tracker_client/domain/entities/user.py b/ya_tracker_client/domain/entities/user.py
index 8e1c1f7..4fdabcc 100644
--- a/ya_tracker_client/domain/entities/user.py
+++ b/ya_tracker_client/domain/entities/user.py
@@ -1,50 +1,30 @@
 from datetime import datetime
 
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class UserShort(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     display: str
 
 
 class User(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     uid: int
     login: str
-    tracker_uid: int = Field(validation_alias=AliasChoices("trackerUid", "tracker_uid"))
-    passport_uid: int = Field(validation_alias=AliasChoices("passportUid", "passport_uid"))
-    cloud_uid: str | None = Field(
-        default=None,
-        validation_alias=AliasChoices("cloudUid", "cloud_uid"),
-    )
-    first_name: str = Field(validation_alias=AliasChoices("firstName", "first_name"))
-    last_name: str = Field(validation_alias=AliasChoices("lastName", "last_name"))
+    tracker_uid: int
+    passport_uid: int
+    cloud_uid: str | None = None
+    first_name: str
+    last_name: str
     display: str
     email: str
     external: bool
-    has_licence: bool | None = Field(
-        default=None,
-        validation_alias=AliasChoices("hasLicence", "has_licence"),
-    )
+    has_licence: bool | None = None
     dismissed: bool
-    user_new_filters: bool | None = Field(
-        default=None,
-        validation_alias=AliasChoices("userNewFilters", "user_new_filters"),
-    )
-    disable_notifications: bool = Field(validation_alias=AliasChoices("disableNotifications", "disable_notifications"))
-    first_login_date: datetime | None = Field(
-        default=None,
-        validation_alias=AliasChoices("firstLoginDate", "first_login_date"),
-    )
-    last_login_date: datetime | None = Field(
-        default=None,
-        validation_alias=AliasChoices("lastLoginDate", "last_login_date"),
-    )
-    welcome_mail_sent: bool | None = Field(
-        default=None,
-        validation_alias=AliasChoices("welcomeMailSent", "welcome_mail_sent"),
-    )
+    user_new_filters: bool | None = None
+    disable_notifications: bool
+    first_login_date: datetime | None = None
+    last_login_date: datetime | None = None
+    welcome_mail_sent: bool | None = None
diff --git a/ya_tracker_client/domain/entities/workflow.py b/ya_tracker_client/domain/entities/workflow.py
index 88ac0c9..64c18f3 100644
--- a/ya_tracker_client/domain/entities/workflow.py
+++ b/ya_tracker_client/domain/entities/workflow.py
@@ -1,10 +1,8 @@
-from pydantic import AliasChoices, Field
-
 from ya_tracker_client.domain.entities.base import AbstractEntity
 
 
 class WorkflowShort(AbstractEntity):
-    url: str = Field(validation_alias=AliasChoices("self", "url"))
+    url: str
     id: str
     key: str
     display: str
diff --git a/ya_tracker_client/domain/repositories/__init__.py b/ya_tracker_client/domain/repositories/__init__.py
index e69de29..8e32fe6 100644
--- a/ya_tracker_client/domain/repositories/__init__.py
+++ b/ya_tracker_client/domain/repositories/__init__.py
@@ -0,0 +1,14 @@
+from ya_tracker_client.domain.repositories.checklist import ChecklistRepository
+from ya_tracker_client.domain.repositories.issue import IssueRepository
+from ya_tracker_client.domain.repositories.issue_relationship import IssueRelationshipRepository
+from ya_tracker_client.domain.repositories.queue import QueueRepository
+from ya_tracker_client.domain.repositories.user import UserRepository
+
+
+__all__ = [
+    "ChecklistRepository",
+    "IssueRepository",
+    "IssueRelationshipRepository",
+    "QueueRepository",
+    "UserRepository",
+]
diff --git a/ya_tracker_client/domain/repositories/checklist.py b/ya_tracker_client/domain/repositories/checklist.py
new file mode 100644
index 0000000..5b6b009
--- /dev/null
+++ b/ya_tracker_client/domain/repositories/checklist.py
@@ -0,0 +1,89 @@
+from json import loads
+
+from ya_tracker_client.domain.entities.checklist import ChecklistCreate, ChecklistItem, ChecklistItemEdit
+from ya_tracker_client.domain.entities.deadline import Deadline
+from ya_tracker_client.domain.entities.issue import IssueWithChecklist
+from ya_tracker_client.domain.repositories.base import EntityRepository
+
+
+class ChecklistRepository(EntityRepository):
+    async def create_checklist_item(
+        self,
+        issue_id: str,
+        text: str,
+        checked: bool | None = None,
+        assignee: str | None = None,
+        deadline: Deadline | None = None,
+    ) -> IssueWithChecklist:
+        """
+        Use this request to create a checklist and add new items to it.
+
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/add-checklist-item
+        """
+        raw_response = await self._client.request(
+            method="POST",
+            uri=f"/issues/{issue_id}/checklistItems",
+            payload=ChecklistCreate(
+                text=text,
+                checked=checked,
+                assignee=assignee,
+                deadline=deadline,
+            ).model_dump(exclude_none=True, by_alias=True),
+        )
+        return IssueWithChecklist(**loads(raw_response))
+
+    async def get_checklist_items(self, issue_id: str) -> list[ChecklistItem]:
+        """
+        Use this request to get the parameters of an issue's checklist.
+
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/get-checklist
+        """
+        raw_response = await self._client.request(
+            method="GET",
+            uri=f"/issues/{issue_id}/checklistItems",
+        )
+        return [ChecklistItem(**raw_checklist_item) for raw_checklist_item in loads(raw_response)]
+
+    async def edit_checklist_item(
+        self,
+        issue_id: str,
+        checklist_item_id: str,
+        text: str,
+        checked: bool | None = None,
+        assignee: str | None = None,
+        deadline: Deadline | None = None,
+    ) -> IssueWithChecklist:
+        """
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/edit-checklist
+        """
+        raw_response = await self._client.request(
+            method="PATCH",
+            uri=f"/issues/{issue_id}/checklistItems/{checklist_item_id}",
+            payload=ChecklistItemEdit(
+                text=text,
+                checked=checked,
+                assignee=assignee,
+                deadline=deadline,
+            ).model_dump(exclude_none=True, by_alias=True),
+        )
+        return IssueWithChecklist(**loads(raw_response))
+
+    async def delete_checklist(self, issue_id: str) -> IssueWithChecklist:
+        """
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/delete-checklist
+        """
+        raw_response = await self._client.request(
+            method="DELETE",
+            uri=f"/issues/{issue_id}/checklistItems",
+        )
+        return IssueWithChecklist(**loads(raw_response))
+
+    async def delete_checklist_item(self, issue_id: str, checklist_item_id: str):
+        """
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/delete-checklist-item
+        """
+        raw_response = await self._client.request(
+            method="DELETE",
+            uri=f"/issues/{issue_id}/checklistItems/{checklist_item_id}",
+        )
+        return IssueWithChecklist(**loads(raw_response))
diff --git a/ya_tracker_client/domain/repositories/issue.py b/ya_tracker_client/domain/repositories/issue.py
index fc30095..54a7ea6 100644
--- a/ya_tracker_client/domain/repositories/issue.py
+++ b/ya_tracker_client/domain/repositories/issue.py
@@ -13,7 +13,7 @@
 class IssueRepository(EntityRepository):
     async def get_issue(self, issue_id: str) -> Issue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/get-issue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/get-issue
         """
         raw_response = await self._client.request(
             method="GET",
@@ -36,7 +36,7 @@ async def create_issue(
         attachment_ids: list[str] | None = None,
     ) -> Issue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/create-issue#queue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/create-issue#queue
         """
         raw_response = await self._client.request(
             method="POST",
@@ -64,7 +64,7 @@ async def edit_issue(
         **kwargs,
     ) -> Issue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/patch-issue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/patch-issue
         """
         raw_response = await self._client.request(
             method="PATCH",
@@ -79,7 +79,7 @@ async def get_priorities(
         localized: bool = True,
     ) -> list[Priority]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/get-priorities
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/get-priorities
         """
         raw_response = await self._client.request(
             method="GET",
@@ -93,7 +93,7 @@ async def get_issue_transitions(
         issue_id: str,
     ) -> list[Transition]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/get-transitions
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/get-transitions
         """
         raw_response = await self._client.request(
             method="GET",
diff --git a/ya_tracker_client/domain/repositories/issue_relationship.py b/ya_tracker_client/domain/repositories/issue_relationship.py
index 3459822..debee33 100644
--- a/ya_tracker_client/domain/repositories/issue_relationship.py
+++ b/ya_tracker_client/domain/repositories/issue_relationship.py
@@ -16,7 +16,7 @@ async def create_issue_relationship(
         relationship: IssueRelationshipTypeEnum,
     ) -> IssueRelationship:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/link-issue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/link-issue
         """
         raw_response = await self._client.request(
             method="POST",
@@ -33,7 +33,7 @@ async def get_issue_relationships(
         issue_id: str,
     ) -> list[IssueRelationship]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/get-links
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/get-links
         """
         raw_response = await self._client.request(
             method="GET",
@@ -47,7 +47,7 @@ async def delete_issue_relationships(
         link_id: int,
     ) -> None:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/issues/delete-link-issue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/issues/delete-link-issue
         """
         await self._client.request(
             method="DELETE",
diff --git a/ya_tracker_client/domain/repositories/queue.py b/ya_tracker_client/domain/repositories/queue.py
index d00efd9..08817d7 100644
--- a/ya_tracker_client/domain/repositories/queue.py
+++ b/ya_tracker_client/domain/repositories/queue.py
@@ -18,7 +18,7 @@ async def create_queue(
         issue_types_config: list[IssueTypeConfig],
     ) -> Queue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/create-queue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/create-queue
         """
         raw_response = await self._client.request(
             method="POST",
@@ -36,7 +36,7 @@ async def create_queue(
 
     async def get_queue(self, queue_id: str | int) -> Queue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/get-queue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/get-queue
         """
         raw_response = await self._client.request(
             method="GET",
@@ -46,7 +46,7 @@ async def get_queue(self, queue_id: str | int) -> Queue:
 
     async def get_queues(self) -> list[Queue]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/get-queues
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/get-queues
         """
         raw_response = await self._client.request(
             method="GET",
@@ -56,7 +56,7 @@ async def get_queues(self) -> list[Queue]:
 
     async def get_queue_versions(self, queue_id: str | int) -> list[QueueVersion]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/get-versions
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/get-versions
         """
         raw_response = await self._client.request(
             method="GET",
@@ -66,22 +66,17 @@ async def get_queue_versions(self, queue_id: str | int) -> list[QueueVersion]:
 
     async def get_queue_fields(self, queue_id: str | int) -> list[QueueField]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/get-fields
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/get-fields
         """
         raw_response = await self._client.request(
             method="GET",
             uri=f"/queues/{queue_id}/fields",
         )
-        for raw_queue_field in loads(raw_response):
-            print(*raw_queue_field.items(), sep="\n")
-            print()
-            QueueField(**raw_queue_field)
-
         return [QueueField(**raw_queue_field) for raw_queue_field in loads(raw_response)]
 
     async def delete_queue(self, queue_id: str | int) -> None:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/delete-queue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/delete-queue
         """
         await self._client.request(
             method="DELETE",
@@ -90,7 +85,7 @@ async def delete_queue(self, queue_id: str | int) -> None:
 
     async def restore_queue(self, queue_id: str | int) -> Queue:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/restore-queue
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/restore-queue
         """
         raw_response = await self._client.request(
             method="POST",
@@ -100,7 +95,7 @@ async def restore_queue(self, queue_id: str | int) -> Queue:
 
     async def delete_tag_in_queue(self, queue_id: str | int, tag_name: str) -> None:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/concepts/queues/delete-tag
+        YC docs: https://cloud.yandex.com/en/docs/tracker/concepts/queues/delete-tag
         """
         await self._client.request(
             method="DELETE",
diff --git a/ya_tracker_client/domain/repositories/user.py b/ya_tracker_client/domain/repositories/user.py
index 93add34..ba90896 100644
--- a/ya_tracker_client/domain/repositories/user.py
+++ b/ya_tracker_client/domain/repositories/user.py
@@ -12,7 +12,7 @@
 class UserRepository(EntityRepository):
     async def get_myself(self) -> User:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/get-user-info
+        YC docs: https://cloud.yandex.com/en/docs/tracker/get-user-info
         """
         raw_response = await self._client.request(
             method="GET",
@@ -26,7 +26,7 @@ async def get_user(
         uid: int | None = None,
     ) -> User:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/get-user
+        YC docs: https://cloud.yandex.com/en/docs/tracker/get-user
         """
         if (login is None) and (uid is None):
             raise ClientError("Please provide login or uid for this request")
@@ -43,7 +43,7 @@ async def get_user(
 
     async def get_users(self) -> list[User]:
         """
-        Yandex Cloud documentation for method: https://cloud.yandex.ru/docs/tracker/get-users
+        YC docs: https://cloud.yandex.com/en/docs/tracker/get-users
         """
         raw_response = await self._client.request(
             method="GET",
diff --git a/ya_tracker_client/service/api.py b/ya_tracker_client/service/api.py
index 0a7c21c..191f90a 100644
--- a/ya_tracker_client/service/api.py
+++ b/ya_tracker_client/service/api.py
@@ -1,7 +1,10 @@
-from ya_tracker_client.domain.repositories.issue import IssueRepository
-from ya_tracker_client.domain.repositories.issue_relationship import IssueRelationshipRepository
-from ya_tracker_client.domain.repositories.queue import QueueRepository
-from ya_tracker_client.domain.repositories.user import UserRepository
+from ya_tracker_client.domain.repositories import (
+    ChecklistRepository,
+    IssueRelationshipRepository,
+    IssueRepository,
+    QueueRepository,
+    UserRepository,
+)
 from ya_tracker_client.infrastructure.client import AiohttpClient
 
 
@@ -10,6 +13,7 @@ class YaTrackerClient(
     IssueRepository,
     QueueRepository,
     UserRepository,
+    ChecklistRepository,
 ):
     def __init__(
         self,
diff --git a/ya_tracker_client/utils/__init__.py b/ya_tracker_client/utils/__init__.py
new file mode 100644
index 0000000..3148016
--- /dev/null
+++ b/ya_tracker_client/utils/__init__.py
@@ -0,0 +1,6 @@
+from ya_tracker_client.utils.encoder import serialize_entity
+
+
+__all__ = [
+    "serialize_entity",
+]
diff --git a/ya_tracker_client/utils/encoder.py b/ya_tracker_client/utils/encoder.py
new file mode 100644
index 0000000..9f360f2
--- /dev/null
+++ b/ya_tracker_client/utils/encoder.py
@@ -0,0 +1,32 @@
+from datetime import datetime
+from decimal import Decimal
+from json import JSONEncoder, dumps
+from uuid import UUID
+from zoneinfo import ZoneInfo
+
+from yarl import URL
+
+
+class UpgradedJSONEncoder(JSONEncoder):
+    def default(self, entity):
+        if isinstance(entity, datetime):
+            if entity.tzinfo is None:  # for YYYY-MM-DDThh:mm:ss.sss±hhmm format
+                entity = entity.replace(tzinfo=ZoneInfo("UTC"))
+            return entity.isoformat()
+
+        if isinstance(entity, Decimal) or isinstance(entity, UUID):
+            return str(entity)
+
+        if isinstance(entity, URL):
+            return str(entity)
+
+        return JSONEncoder.default(self, entity)
+
+
+def serialize_entity(entity):
+    return dumps(entity, cls=UpgradedJSONEncoder)
+
+
+__all__ = [
+    "serialize_entity",
+]