from typing import Union

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel, HttpUrl

app = FastAPI()


class Invoice(BaseModel):
    id: str
    title: Union[str, None] = None
    customer: str
    total: float


class InvoiceEvent(BaseModel):
    description: str
    paid: bool


class InvoiceEventReceived(BaseModel):
    ok: bool


invoices_callback_router = APIRouter()

                            # TODO: remove when deprecating Pydantic v1
                            {"title": "Title", "type": "string"}
                        ),
                        "customer": {"title": "Customer", "type": "string"},
                        "total": {"title": "Total", "type": "number"},
                    },
                },
                "InvoiceEvent": {

                                # TODO: remove when deprecating Pydantic v1
                                {"title": "Title", "type": "string"}
                            ),
                            "customer": {"title": "Customer", "type": "string"},
                            "total": {"title": "Total", "type": "number"},
                        },
                    },
                    "InvoiceEvent": {