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```python
# AI Dev Tool: Revolut API Integration Wrapper for FastAPI Pydantic v2 Micro-SaaS
# Description: A production-ready API integration wrapper for Revolut's API, 
#              built with FastAPI and Pydantic v2, featuring robust error handling 
#              and type annotations.

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

app = FastAPI()

# Define the Revolut API settings
class RevolutAPISettings(BaseModel):
    """Revolut API settings"""
    base_url: str = "https://api.revolut.com"
    client_id: str
    client_secret: str
    access_token: Optional[str]

# Define the Revolut API client
class RevolutAPIClient:
    """Revolut API client"""
    def __init__(self, settings: RevolutAPISettings):
        self.settings = settings

def get_access_token(self) -> str:
        """Get access token using client credentials"""
        auth_url = f"{self.settings.base_url}/auth/token"
        headers = {"Content-Type": "application/x-www-form-urlencoded"}
        data = {
            "grant_type": "client_credentials

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