после оплаты бот не отправляет сообщение aiogram

после оплаты бот не отправляет сообщение пользователю

import datetime, threading, time
from pyqiwip2p import QiwiP2P
from pyqiwip2p.types import QiwiCustomer, QiwiDatetime
from datetime import timedelta
from aiogram.types import ParseMode
from aiogram.contrib.fsm_storage.memory import MemoryStorage
from aiogram import Bot, Dispatcher, types, executor
from aiogram.dispatcher.filters.state import State, StatesGroup
from aiogram.dispatcher import FSMContext


p2p = QiwiP2P(auth_key="приватныйключ")
bot = Bot("токен")
dp = Dispatcher(bot, storage=MemoryStorage())
now = datetime.datetime.now()


@dp.message_handler(commands=['start', 'help'])
async def welcome(message: types.Message):
    try:
        p2p.reject(bill_id=new_bill.bill_id)
    except:
        pass
    await message.answer('привет...')



@dp.message_handler(commands=['pay_qiwi_1'])
async def buy(message: types.Message):
    global bill
    price = 15
    lifetime = 150
    comment = 'Услуга'
    bill = p2p.bill(amount=price, lifetime=lifetime, comment=comment)
    link_oplata = bill.pay_url
    await message.answer(f'<a href="{link_oplata}">Ссылка на оплату Qiwi {price} р.</a>', parse_mode="HTML")
    x = threading.Thread(target=functionoplata, args=(message,))
    x.start() #Запуск потока


def functionoplata(message):
    oplata_time = datetime.datetime.now()
    datetime_delta = oplata_time + timedelta(minutes=7)
    while True:
        status = p2p.check(bill_id=bill.bill_id).status
        if status == 'PAID':
            text = "оплата прошла!"
            break
            return text
        elif datetime.datetime.now() > datetime_delta:
            text = "ссылка недействительна"
            break
            return text
    time.sleep(0.1)


if __name__ == '__main__':
    executor.start_polling(dp)