Bird vs Twilio.

import twilio from "twilio";

const client = twilio(
  process.env.TWILIO_ACCOUNT_SID,
  process.env.TWILIO_AUTH_TOKEN,
);

const verification = await client.verify.v2
  .services(process.env.TWILIO_VERIFY_SID)
  .verifications.create({
    to:      "+15005550006",
    channel: "sms",
  });

console.log(verification.status);
// → "pending"

// Then later, on user input:
const check = await client.verify.v2
  .services(process.env.TWILIO_VERIFY_SID)
  .verificationChecks.create({
    to:   "+15005550006",
    code: userInput,
  });

console.log(check.status);
// → "approved" | "pending"
// 21 lines total.

import { BirdClient } from "@bird/sdk";

const bird = new BirdClient({ apiKey: process.env.BIRD_API_KEY! });

const { data: ver, error } = await bird.verifications.start({
  to:      "+15005550006",
  channel: "sms",
  fallback: "voice",
});

if (error) throw error;
console.log(ver.id, ver.status);
// → "ver_2bX91Yk8h" "pending"

// Then later, on user input:
const { data: check } = await bird.verifications.check({
  id:   ver.id,
  code: userInput,
});

console.log(check.status);
// → "approved" | "pending" | "expired"
// 14 lines total. Fallback to voice is one attribute,
// not a separate Service SID.