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```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]

# Initialize the FastAPI app
app = FastAPI()

# PostgreSQL database connection settings
DB_HOST = "localhost"
DB_NAME = "payment_gateway"
DB_USER = "payment_gateway_user"
DB_PASSWORD = "payment_gateway_password"

# Establish a connection to the PostgreSQL database
def get_db_connection():
    try:
        return psycopg2.connect(
            host=DB_HOST,
            database=DB_NAME,
            user=DB_USER,
            password=DB_PASSWORD,
            cursor_factory=DictCursor
        )
    except Error as e:
        print(f"Error connecting to database:

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