A Telegram bot for SMS verification resellers

# Minimal Telegram bot: /code <service> <country>  (python-telegram-bot v21)
import os, asyncio, httpx
from telegram import Update
from telegram.ext import ApplicationBuilder, CommandHandler, ContextTypes

API = "https://noirsms.com/api/v1"
H = {"Authorization": f"Bearer {os.environ['NOIRSMS_KEY']}"}

async def code(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    service, country = ctx.args[0], ctx.args[1]
    async with httpx.AsyncClient(headers=H, timeout=20) as c:
        n = (await c.post(f"{API}/numbers", json={"service": service, "country": country})).json()
        if "error" in n:
            return await update.message.reply_text(n["error"]["message"])
        await update.message.reply_text(f"Your number: +{n['phone']}")
        for _ in range(300):
            s = (await c.get(f"{API}/numbers/{n['id']}")).json()
            if s["status"] == "received":
                return await update.message.reply_text(f"Code: {s['sms'][0]['code']}")
            if s["status"] in ("canceled", "expired"):
                return await update.message.reply_text("No SMS arrived; the charge was refunded.")
            await asyncio.sleep(4)

app = ApplicationBuilder().token(os.environ["BOT_TOKEN"]).build()
app.add_handler(CommandHandler("code", code))
app.run_polling()