AI Dev Tool: Visa Mastercard Major Banks

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Preview Code

```python
# AI Dev Tool: PaymentGatewaymd SaaS Template
# A FastAPI Pydantic v2 Micro-SaaS for handling payment gateways

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional
import psycopg2
from psycopg2 import Error
from psycopg2.extras import DictCursor

# Define the Payment Gateway model
class PaymentGateway(BaseModel):
    id: int
    name: str
    fee: float
    description: Optional[str]

# Define the Payment model
class Payment(BaseModel):
    id: int
    payment_gateway_id: int
    amount: float
    description: Optional[str]

# ... full runnable version includes tests & documentation