⚡ Live Sandbox: AI Dev Tool: Visa Mastercard major banks

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```python
# AI Dev Tool: Visa Mastercard Major Banks Litigation Fees API
# Description: API Integration Wrapper for Visa, Mastercard, and major banks' litigation fees
# Author: Elite Software Architect and Micro-SaaS Developer

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional

app = FastAPI()

# Define the request body model for litigation fees
class LitigationFeesRequest(BaseModel):
    """Request body model for litigation fees"""
    bank_name: str
    fee_type: str
    amount: float

# Define the response model for litigation fees
class LitigationFeesResponse(BaseModel):
    """Response model for litigation fees"""
    bank_name: str
    fee_type: str
    amount: float
    litigation_status: str

# Mock data for litigation fees (replace with actual database or API calls)
litigation_fees_data = {
    "Visa": {"fee_type": "processing", "amount": 0.05, "litigation_status": "pending"},
    "Mastercard": {"fee_type": "transaction", "amount": 0.03, "litigation_status": "settled"},
    "Major Bank": {"fee

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