CODE EXAMPLE FOR PYTHON

python telegram bot login

import telebot
import time

bot = telebot.TeleBot('TOKEN')

def extract_unique_code(text):
    # Extracts the unique_code from the sent /start command.
    return text.split()[1] if len(text.split()) > 1 else None

def in_storage(unique_code): 
    # Should check if a unique code exists in storage
    return True

def get_username_from_storage(unique_code): 
    # Does a query to the storage, retrieving the associated username
    # Should be replaced by a real database-lookup.
    return "ABC" if in_storage(unique_code) else None

def save_chat_id(chat_id, username):
    # Save the chat_id->username to storage
    # Should be replaced by a real database query.
    pass

@bot.message_handler(commands=['start'])
def send_welcome(message):
    unique_code = extract_unique_code(message.text)
    if unique_code: # if the '/start' command contains a unique_code
        username = get_username_from_storage(unique_code)
        if username: # if the username exists in our database
            save_chat_id(message.chat.id, username)
            reply = "Hello {0}, how are you?".format(username)
        else:
            reply = "I have no clue who you are..."
    else:
        reply = "Please visit me via a provided URL from the website."
    bot.reply_to(message, reply)

bot.polling()

while True:
    time.sleep(0)