feat: add adaptive fee

src/infrastructure/config/settings.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-from decimal import Decimal
 from functools import lru_cache
 from typing import List, Literal
 import os
@@ -95,8 +94,6 @@ class Settings(BaseSettings):
     ITPAY_PUBLIC_ID: str
     ITPAY_API_SECRET: str
 
-    PAYMENT_SERVICE_FEE_RATE: Decimal = Field(gt=0)
-
     CLOUD_KASSIR_PUBLIC_ID: str = ''
     CLOUD_KASSIR_API_SECRET: str = ''