#Creating a billing system that links to a MikroTik router and the Daraja API (which is used for M-Pesa transactions) is quite a comprehensive project. Here's a high-level overview of what you need to do:

#Set up MikroTik Router:

#Configure the router to handle user connections and bandwidth limitations.
#Ensure the router can communicate with your billing system via API or scripts.
#Set up a Web Server:

#Use a web server (e.g., Apache or Nginx) to host the billing system.
#Use a server-side language like PHP, Python, or Node.js for backend processing.
#Integrate Daraja API:

#Register an application on the Daraja API platform to get access credentials.
#Use the API to handle payments and check transaction status.
#Develop the Billing System:

#Create a user interface for customers to log in, view their billing details, and make payments.
#Implement backend logic to handle user authentication, billing calculations, and interaction with the MikroTik router and Daraja API.
#Below is a simplified example of how you might set up the backend in Python using Flask, which will communicate with the MikroTik router via its API and handle payments through the Daraja API.

#1. Install Required Libraries
#First, install the necessary libraries://

pip install flask requests

#2. Set Up MikroTik API Communication
#You can use the librouteros library to communicate with MikroTik:

pip install librouteros

#3. Create Flask Application
#Here's a basic structure for your Flask application://

from flask import Flask, request, jsonify
import requests
from librouteros import connect

app = Flask(__name__)

# MikroTik connection details
MT_HOST = 'your_mikrotik_ip'
MT_USER = 'your_mikrotik_username'
MT_PASS = 'your_mikrotik_password'

# Daraja API credentials
DARJA_CONSUMER_KEY = 'your_daraja_consumer_key'
DARJA_CONSUMER_SECRET = 'your_daraja_consumer_secret'

def get_mikrotik_connection():
    return connect(username=MT_USER, password=MT_PASS, host=MT_HOST)

@app.route('/pay', methods=['POST'])
def pay():
    data = request.json
    phone_number = data['phone_number']
    amount = data['amount']

    # Step 1: Initiate payment via Daraja API
    token = get_daraja_token()
    payment_response = initiate_payment(token, phone_number, amount)

    if payment_response['ResponseCode'] == '0':
        # Payment successful
        # Step 2: Update MikroTik user details
        update_mikrotik_user(phone_number, amount)
        return jsonify({'message': 'Payment successful and user updated'})
    else:
        return jsonify({'message': 'Payment failed'}), 400

def get_daraja_token():
    response = requests.get(
        'https://sandbox.safaricom.co.ke/oauth/v1/generate?grant_type=client_credentials',
        auth=(DARJA_CONSUMER_KEY, DARJA_CONSUMER_SECRET)
    )
    json_response = response.json()
    return json_response['access_token']

def initiate_payment(token, phone_number, amount):
    headers = {
        'Authorization': f'Bearer {token}',
        'Content-Type': 'application/json'
    }
    payload = {
        'BusinessShortCode': 'your_shortcode',
        'Password': 'generated_password',
        'Timestamp': 'timestamp',
        'TransactionType': 'CustomerPayBillOnline',
        'Amount': amount,
        'PartyA': phone_number,
        'PartyB': 'your_shortcode',
        'PhoneNumber': phone_number,
        'CallBackURL': 'https://your_callback_url',
        'AccountReference': 'account_reference',
        'TransactionDesc': 'Payment for services'
    }
    response = requests.post(
        'https://sandbox.safaricom.co.ke/mpesa/stkpush/v1/processrequest',
        headers=headers,
        json=payload
    )
    return response.json()

def update_mikrotik_user(phone_number, amount):
    api = get_mikrotik_connection()
    # Example: Add time based on amount
    # You need to customize this according to your billing strategy
    api(cmd='/ip/hotspot/user/set', numbers='user1', profile='paid_profile')
    # Close connection
    api.close()

if __name__ == '__main__':
    app.run(debug=True)

