diff --git a/config.py b/config.py
index 6393a2d..16ea2d4 100644
--- a/config.py
+++ b/config.py
@@ -13,6 +13,11 @@ class settings(BaseSettings):
     admin_group_id: int = Field(alias="ADMIN_GROUP_ID")
     remnawave_url: str = Field(alias="REMNAWAVE_URL")
     remnawave_token: str = Field(alias="REMNAWAVE_TOKEN")
+    min_devices: int = Field(3, alias="MIN_DEVICES")
+    max_devices: int = Field(12, alias="MAX_DEVICES")
+    per_device_cost: int = Field(50, alias="PER_DEVICE_COST")
+    whitelist_cost: int = Field(100, alias="WHITELIST_COST")
+    whitelist_device_threshold: int = Field(6, alias="WHITELIST_DEVICE_THRESHOLD")
 
 
 settings = settings()  # type: ignore
diff --git a/dto/__init__.py b/dto/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/dto/di.py b/dto/di.py
deleted file mode 100644
index 17ea5ec..0000000
--- a/dto/di.py
+++ /dev/null
@@ -1,14 +0,0 @@
-from dataclasses import dataclass
-
-from repositories.tickets import TicketRepository
-from repositories.users import UserRepository
-from services.user_service import UserService
-from remnawave import RemnawaveSDK
-
-
-@dataclass
-class DependenciesDTO:
-    ticket_repository: TicketRepository
-    user_repository: UserRepository
-    user_service: UserService
-    rw_sdk: RemnawaveSDK
diff --git a/dto/tickets.py b/dto/tickets.py
deleted file mode 100644
index fa33e84..0000000
--- a/dto/tickets.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from dataclasses import dataclass
-
-
-@dataclass
-class NewTicketDTO:
-    creator_id: int
diff --git a/dto/users.py b/dto/users.py
deleted file mode 100644
index cd6466c..0000000
--- a/dto/users.py
+++ /dev/null
@@ -1,14 +0,0 @@
-from dataclasses import dataclass
-from typing import Optional
-
-
-@dataclass
-class NewUserDTO:
-    id: int
-    referal: int
-
-
-@dataclass
-class TicketCreator:
-    id: int
-    username: Optional[str] = None
diff --git a/handlers/__init__.py b/handlers/__init__.py
index be3ff80..4a98d04 100644
--- a/handlers/__init__.py
+++ b/handlers/__init__.py
@@ -1,4 +1,5 @@
 from .menus import router as menus_router
 from .support import router as support_router
+from .buy import router as buy_router
 
-routers = [menus_router, support_router]
+routers = [menus_router, support_router, buy_router]
diff --git a/handlers/buy.py b/handlers/buy.py
index e1bc233..d4e4aef 100644
--- a/handlers/buy.py
+++ b/handlers/buy.py
@@ -1,10 +1,153 @@
-from aiogram import Router
+from typing import Optional
+from aiogram import Router, F
 from aiogram.types import CallbackQuery
 from aiogram.fsm.context import FSMContext
 
-from dto.di import DependenciesDTO
-
+from keyboards.client import devices_selector, duration_selector
+from misc.utils import calculate_price, convert_int_to_duration
+from schemas.subscriptions import SubscriptionPlan
+from states.buy import SubscriptionStorage
+from texts import (
+    CALLBACK_FALLBACK,
+    CONTEXT_REINITIATED,
+    NOTHING_PLACEHOLDER,
+    SUBSCRIPTION_DEVICE_SELECTOR,
+    SUBSCRIPTION_DURATION_SELECTOR,
+)
+from config import settings
 
 router = Router()
 
-# @router.callback_query()
+
+@router.callback_query(F.data == "buy")
+async def buy_init(cb: CallbackQuery, state: FSMContext):
+    await state.clear()
+
+    ctx = SubscriptionPlan()
+    await cb.message.edit_text(
+        SUBSCRIPTION_DEVICE_SELECTOR.format(price=calculate_price(ctx)),
+        reply_markup=devices_selector(settings.min_devices),
+    )
+
+    await state.set_state(SubscriptionStorage.devices)
+    await state.set_data({"ctx": ctx})
+
+
+@router.callback_query(F.data.startswith("devices:"))
+async def device_count_select(cb: CallbackQuery, state: FSMContext):
+    data = await state.get_data()
+    await state.clear()
+
+    ctx: Optional[SubscriptionPlan] = data.get("ctx", SubscriptionPlan())
+
+    cb_data = cb.data.split(":")
+    devices = int(cb_data[1]) if cb_data[1].isdigit() else settings.min_devices
+    ctx.devices = devices
+    ctx.whitelists = ctx.whitelists or devices >= settings.whitelist_device_threshold
+
+    await cb.message.edit_text(
+        SUBSCRIPTION_DEVICE_SELECTOR.format(price=calculate_price(ctx)),
+        reply_markup=devices_selector(current=ctx.devices, whitelists=ctx.whitelists),
+    )
+    await state.set_state(SubscriptionStorage.devices)
+    await state.set_data({"ctx": ctx})
+
+
+@router.callback_query(SubscriptionStorage.devices, F.data == "whitelist:toggle")
+async def toggle_whitelists(cb: CallbackQuery, state: FSMContext):
+    data = await state.get_data()
+    await state.clear()
+
+    ctx: Optional[SubscriptionPlan] = data.get("ctx")
+    if not ctx:
+        await state.set_state(SubscriptionPlan())
+        await state.set_data({"ctx": ctx})
+        await cb.answer(CALLBACK_FALLBACK)
+        return
+    ctx.whitelists = (
+        not ctx.whitelists or ctx.devices >= settings.whitelist_device_threshold
+    )
+
+    try:
+        await cb.message.edit_reply_markup(
+            SUBSCRIPTION_DEVICE_SELECTOR.format(price=calculate_price(ctx)),
+            reply_markup=devices_selector(
+                current=ctx.devices, whitelists=ctx.whitelists
+            ),
+        )
+    except Exception as exc:
+        if "message is not modified:" in str(exc):
+            await cb.answer(NOTHING_PLACEHOLDER)
+        else:
+            await cb.answer(CALLBACK_FALLBACK)
+    await state.set_state(SubscriptionStorage.devices)
+    await state.set_data({"ctx": ctx})
+
+
+@router.callback_query(SubscriptionStorage.devices, F.data == "confirm")
+async def select_duration_init(cb: CallbackQuery, state: FSMContext):
+    data = await state.get_data()
+    await state.clear()
+
+    ctx: Optional[SubscriptionPlan] = data.get("ctx")
+    if not ctx:
+        await state.set_state(SubscriptionPlan())
+        await state.set_data({"ctx": ctx})
+        await cb.answer(CALLBACK_FALLBACK)
+        return
+
+    try:
+        await cb.message.edit_text(
+            SUBSCRIPTION_DURATION_SELECTOR.format(price=calculate_price(ctx)),
+            reply_markup=duration_selector(
+                current=ctx.duration, back_cb=f"devices:{ctx.devices}"
+            ),
+        )
+    except Exception as exc:
+        if "message is not modified:" in str(exc):
+            await cb.answer(NOTHING_PLACEHOLDER)
+        else:
+            await cb.answer(CALLBACK_FALLBACK)
+            raise
+
+    await state.set_state(SubscriptionStorage.duration)
+    await state.set_data({"ctx": ctx})
+
+
+@router.callback_query(F.data.startswith("duration:"))
+async def select_duration(cb: CallbackQuery, state: FSMContext):
+    data = await state.get_data()
+    await state.clear()
+
+    ctx: Optional[SubscriptionPlan] = data.get("ctx")
+    if not ctx:
+        await state.set_state()
+        await state.set_data({"ctx": ctx})
+        await cb.answer(CONTEXT_REINITIATED)
+        ctx = SubscriptionPlan()
+
+    cb_data = cb.data.split(":")
+    duration = int(cb_data[1]) if cb_data[1].isdigit() else 1
+    ctx.duration = convert_int_to_duration(duration)
+    try:
+        await cb.message.edit_text(
+            SUBSCRIPTION_DURATION_SELECTOR.format(price=calculate_price(ctx)),
+            reply_markup=duration_selector(
+                current=ctx.duration, back_cb=f"devices:{ctx.devices}"
+            ),
+        )
+    except Exception as exc:
+        if "message is not modified:" in str(exc):
+            await cb.answer(NOTHING_PLACEHOLDER)
+        else:
+            await cb.answer(CALLBACK_FALLBACK)
+            raise
+
+    await state.set_state(SubscriptionStorage.duration)
+    await state.set_data({"ctx": ctx})
+
+
+@router.callback_query(SubscriptionStorage.duration, F.data == "confirm")
+async def proceed_to_checkout(cb: CallbackQuery, state: FSMContext):
+    await cb.answer("yay!!!! fuck off.")
+    ...
diff --git a/handlers/menus.py b/handlers/menus.py
index fd80459..0118289 100644
--- a/handlers/menus.py
+++ b/handlers/menus.py
@@ -4,7 +4,7 @@ from aiogram.types import CallbackQuery, Message
 from aiogram.fsm.context import FSMContext
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from dto.di import DependenciesDTO
+from schemas.di import DependenciesDTO
 from keyboards.client import main_menu
 from texts import build_main_menu_text
 
diff --git a/handlers/support.py b/handlers/support.py
index fffa37a..98659c8 100644
--- a/handlers/support.py
+++ b/handlers/support.py
@@ -6,7 +6,7 @@ from aiogram.types import CallbackQuery, Message
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from config import settings
-from dto.di import DependenciesDTO
+from schemas.di import DependenciesDTO
 from services.user_service import UserServiceException
 from states.support import SupportStorage
 from texts import GENERAL_PROCESSING, STANDARD_FALLBACK, SUPPORT_INIT, SUPPORT_MSG_SENT
diff --git a/keyboards/client.py b/keyboards/client.py
index 0ebb909..fc92341 100644
--- a/keyboards/client.py
+++ b/keyboards/client.py
@@ -1,6 +1,10 @@
 from aiogram.types import InlineKeyboardButton, InlineKeyboardMarkup
 from aiogram.utils.keyboard import InlineKeyboardBuilder
 
+from config import settings
+from misc.utils import convert_duration_to_int
+from schemas.subscriptions import SubscriptionDuration
+
 main_menu: InlineKeyboardMarkup = InlineKeyboardBuilder(
     [
         [
@@ -14,6 +18,71 @@ main_menu: InlineKeyboardMarkup = InlineKeyboardBuilder(
     ]
 ).as_markup()
 
+_return_to_menu_btn: InlineKeyboardButton = InlineKeyboardButton(
+    text="⬅️ Назад", callback_data="menu:main"
+)
+
+
+def _return_btn(
+    data: str = "menu:main", text: str = "⬅️ Назад"
+) -> InlineKeyboardButton:
+    return InlineKeyboardButton(text=text, callback_data=data)
+
+
 return_to_menu: InlineKeyboardMarkup = InlineKeyboardBuilder(
-    [[InlineKeyboardButton(text="⬅️ Назад", callback_data="menu:main")]]
+    [[_return_to_menu_btn]]
 ).as_markup()
+
+
+def devices_selector(current: int = settings.min_devices, whitelists: bool = False):
+    builder = InlineKeyboardBuilder()
+
+    buttons = [
+        InlineKeyboardButton(
+            text=f"{'✅ ' if i == current else ''}{i}", callback_data=f"devices:{i}"
+        )
+        for i in range(settings.min_devices, settings.max_devices + 1)
+    ]
+    builder.add(*buttons).adjust(6)
+
+    wl_icon = "✅ " if whitelists else ""
+    builder.row(
+        InlineKeyboardButton(
+            text=f"{wl_icon}Обход Белых Списков (+100₽)",
+            callback_data="whitelist:toggle",
+        )
+    )
+    builder.row(InlineKeyboardButton(text="🟢", callback_data="confirm"))
+    builder.row(_return_to_menu_btn)
+
+    return builder.as_markup()
+
+
+def duration_selector(
+    current: SubscriptionDuration = SubscriptionDuration.MONTH,
+    back_cb: str = "menu:main",
+) -> InlineKeyboardMarkup:
+    builder = InlineKeyboardBuilder()
+    duration_int = convert_duration_to_int(current)
+
+    durations = [
+        (1, "1 Месяц"),
+        (3, "3 Месяца"),
+        (6, "6 Месяцев"),
+        (12, "1 Год"),
+    ]
+
+    for val, label in durations:
+        is_selected = val == duration_int
+
+        builder.button(
+            text=f"{'✅ ' if is_selected else ''}{label}",
+            callback_data=f"duration:{val}",
+        )
+
+    builder.row(
+        InlineKeyboardButton(text="🛒 Перейти к оплате", callback_data="confirm")
+    )
+    builder.row(_return_btn(back_cb))
+
+    return builder.as_markup()
diff --git a/main.py b/main.py
index 33f6cb5..d89c2a8 100644
--- a/main.py
+++ b/main.py
@@ -6,7 +6,7 @@ from aiogram import Bot, Dispatcher
 from aiogram.client.default import DefaultBotProperties
 from aiogram.client.session.aiohttp import AiohttpSession
 
-from dto.di import DependenciesDTO
+from schemas.di import DependenciesDTO
 from handlers import routers
 from middlewares import DIMiddleware
 from config import settings
diff --git a/middlewares/di.py b/middlewares/di.py
index a1672c7..89219cd 100644
--- a/middlewares/di.py
+++ b/middlewares/di.py
@@ -3,7 +3,7 @@ from aiogram import BaseMiddleware
 from aiogram.types import TelegramObject
 from sqlalchemy.ext.asyncio import async_sessionmaker
 
-from dto.di import DependenciesDTO
+from schemas.di import DependenciesDTO
 
 
 class DIMiddleware(BaseMiddleware):
diff --git a/misc/utils.py b/misc/utils.py
index ffad1b7..a4d96c0 100644
--- a/misc/utils.py
+++ b/misc/utils.py
@@ -1,7 +1,9 @@
 from typing import Optional
 from random import choice
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 
+from config import settings
+from schemas.subscriptions import SubscriptionDuration, SubscriptionPlan
 import texts
 
 QUOTES: list[str] = [
@@ -125,3 +127,45 @@ def format_username(username: Optional[str]) -> str:
     if username:
         return "@" + username
     return texts.NO_USERNAME
+
+
+def convert_duration_to_int(duration: SubscriptionDuration) -> int:
+    mapping: dict[str, int] = {
+        SubscriptionDuration.MONTH.value: 1,
+        SubscriptionDuration.THREE_MONTHS.value: 3,
+        SubscriptionDuration.SIX_MONTHS.value: 6,
+        SubscriptionDuration.YEAR.value: 12,
+    }
+    return mapping.get(duration.value, 1)
+
+
+def convert_int_to_duration(value: int) -> SubscriptionDuration:
+    mapping: dict[int, SubscriptionDuration] = {
+        1: SubscriptionDuration.MONTH,
+        3: SubscriptionDuration.THREE_MONTHS,
+        6: SubscriptionDuration.SIX_MONTHS,
+        12: SubscriptionDuration.YEAR,
+    }
+    return mapping.get(value, SubscriptionDuration.MONTH)
+
+
+def convert_duration_to_timedelta(duration: SubscriptionDuration) -> timedelta:
+    MONTH_DELTA = timedelta(days=30)
+    mapping: dict[str, timedelta] = {
+        SubscriptionDuration.MONTH.value: MONTH_DELTA,
+        SubscriptionDuration.THREE_MONTHS.value: MONTH_DELTA * 3,
+        SubscriptionDuration.SIX_MONTHS.value: MONTH_DELTA * 6,
+        SubscriptionDuration.YEAR.value: MONTH_DELTA * 12,
+    }
+    return mapping.get(duration.value, MONTH_DELTA)
+
+
+def calculate_price(subscription: SubscriptionPlan):
+    return (
+        (subscription.devices * settings.per_device_cost)
+        + (
+            int(subscription.whitelists) * settings.whitelist_cost
+            if subscription.devices < settings.whitelist_device_threshold
+            else 0
+        )
+    ) * convert_duration_to_int(subscription.duration)
diff --git a/repositories/tickets.py b/repositories/tickets.py
index c05a181..8489eff 100644
--- a/repositories/tickets.py
+++ b/repositories/tickets.py
@@ -3,7 +3,7 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from db.models.tickets import Ticket, TicketStatus
-from dto.tickets import NewTicketDTO
+from schemas.tickets import NewTicketDTO
 
 
 class TicketRepository:
diff --git a/repositories/users.py b/repositories/users.py
index f9968a7..ee35aa3 100644
--- a/repositories/users.py
+++ b/repositories/users.py
@@ -3,7 +3,7 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from db.models import User
-from dto.users import NewUserDTO
+from schemas.users import NewUserDTO
 
 
 class UserRepository:
diff --git a/services/user_service.py b/services/user_service.py
index a6a9ca5..e2238c0 100644
--- a/services/user_service.py
+++ b/services/user_service.py
@@ -6,8 +6,8 @@ from remnawave import RemnawaveSDK
 from config import settings
 from db.models.tickets import TicketStatus
 from db.models.users import User
-from dto.tickets import NewTicketDTO
-from dto.users import NewUserDTO, TicketCreator
+from schemas.tickets import NewTicketDTO
+from schemas.users import NewUserDTO, TicketCreator
 from repositories import UserRepository
 from repositories.tickets import TicketRepository
 from services.rw import RWUserInfo, get_user_by_telegram_id
@@ -107,7 +107,6 @@ class UserService:
 
         if ticket:
             try:
-                print(ticket.thread_id)
                 await msg.copy_to(
                     chat_id=settings.admin_group_id, message_thread_id=ticket.thread_id
                 )
diff --git a/texts.py b/texts.py
index 6da8ea1..eac494d 100644
--- a/texts.py
+++ b/texts.py
@@ -38,8 +38,19 @@ STANDARD_FALLBACK = (
     "<b>❌ Что-то пошло не так</b>, прожмите /start и повторите попытку позже."
 )
 
+CALLBACK_FALLBACK = "❌ Что-то пошло не так"
+CONTEXT_REINITIATED = "🔴 Контекст данного взаимодействия сброшен. Данные могут отличаться от указанных вами."
+
 GENERAL_PROCESSING = "<i>⏳ Выполняю...</i>"
 
+SUBSCRIPTION_DEVICE_SELECTOR = (
+    "выбери колво устройств епта. тут ещё цена есть смотри опа: {price}"
+)
+WHITELISTS_ALREADY_ON = "уже включены!"
+SUBSCRIPTION_DURATION_SELECTOR = (
+    "тут короче сколько время. а ещё цена смотри ОПА {price}"
+)
+
 SUPPORT_INIT = f"<b>{MALENIA_SUPPORT} <i>Что-то не работает? Жалоба? Предложение?</i></b>\n— всё сюда, желательно со скриншотами. Чем детальнее описание, тем быстрее ответ.\n\n<i>❌ Для отмены — /cancel</i>"
 SUPPORT_MSG_SENT = "⏳ Сообщение отправлено. Для выхода — /cancel, вы можете вернуться сюда из главного меню в любое время."
 SUPPORT_SIGNATURE = "<b>✍️ Сообщение от технической поддержки:</b>"
@@ -122,3 +133,6 @@ TRAFFIC_WITH_LIMIT = "{used} / {limit}"
 
 # Шаблон для отображения трафика без лимита: {used}
 TRAFFIC_NO_LIMIT = "{used}"
+
+
+NOTHING_PLACEHOLDER = "🍃"