Add E-Signatures to FastAPI

from fastapi import FastAPI
from pydantic import BaseModel
import httpx

app = FastAPI()

class ContractRequest(BaseModel):
    content: str
    senderName: str
    senderEmail: str
    recipientName: str
    recipientEmail: str

@app.post("/send-contract")
async def send_contract(req: ContractRequest):
    async with httpx.AsyncClient() as client:
        response = await client.post(
            "https://signb.ee/api/send",
            headers={"Authorization": f"Bearer {SIGNBEE_API_KEY}"},
            json=req.dict(),
        )
    return response.json()