from pydantic import BaseModel
from typing import List, Union


class Parent(BaseModel):
    f: str


class TaxesToBePaidCard(Parent):
    id: int


class TaxesToSignCard(Parent):
    id: int


class Test(BaseModel):
    cards: Union[List[TaxesToBePaidCard], List[TaxesToSignCard]]


cards_1 = TaxesToBePaidCard(id=1, f="1")

cards_2 = TaxesToSignCard(id=1, f="1")


test_1 = Test(cards=[cards_1])
test_2 = Test(cards=[cards_2])

print(test_1.dict())
print(test_2.dict())