title: How to remove captcha verification from Firebase phone auth using javascript?
body: <p>I am using firebase phone auth for the very first time and I see captcha verification is must proceed with the process, as per firebase official documentation. Though it serves a good purpose, but sometimes it becomes very bad for the user experience when it starts asking about the road signs, bridges and all. Is there a way to directly skip to the verification code right after getting user's number? As per the documentation, the code is mentioned below. Thanks.</p>
  
  <pre><code>var phoneNumber = getPhoneNumberFromUserInput();
  var appVerifier = window.recaptchaVerifier;
  firebase.auth().signInWithPhoneNumber(phoneNumber, appVerifier)
      .then(function (confirmationResult) {
        // SMS sent. Prompt user to type the code from the message, then sign the
        // user in with confirmationResult.confirm(code).
        window.confirmationResult = confirmationResult;
      }).catch(function (error) {
        // Error; SMS not sent
        // ...
  });
  
  var code = getCodeFromUserInput();
  confirmationResult.confirm(code).then(function (result) {
    // User signed in successfully.
    var user = result.user;
    // ...
  }).catch(function (error) {
    // User couldn't sign in (bad verification code?)
    // ...
  });
  </code></pre>