fix: bill of payment generation refactoring

services/billing.py

@@ -1,16 +1,15 @@
 from io import BytesIO
-from pathlib import Path
 from typing import List
 
 from fastapi import HTTPException
-from jinja2 import Environment, FileSystemLoader
 from number_to_string import get_string_by_number
 from sqlalchemy import select
 from sqlalchemy.orm import selectinload
 from starlette import status
-from weasyprint import HTML
+from weasyprint import HTML, CSS
 
 import backend.config
+import constants
 from constants import MONTHS, ENV
 from external.billing import BillingClient, CreateBillingRequestValue, CreateBillRequestSchema, CreateBillRequestItems, \
     BillStatusUpdateRequest, NotificationChannel, NotifyReceivedBillRequestSchema, DeleteBillRequestSchema
@@ -195,6 +194,6 @@ class BillingService(BaseService):
     async def create_billing_document_pdf(self, deal_id) -> BytesIO:
         doc = await self._create_billing_document_html(deal_id)
         pdf_file = BytesIO()
-        HTML(string=doc).write_pdf(pdf_file)
+        HTML(string=doc).write_pdf(pdf_file, stylesheets=[CSS(constants.APP_PATH + '/static/css/bill-of-payment.css')])
 
         return pdf_file