Implementation Guide

function otpStartStep(phoneNumberNeeded, phoneValidationError) {
  return new Promise((resolve, reject) => {
    // Since no phone number is needed, don't prompt the user.
    resolve(null);
  });
}

function otpFinishStep(otpError) {
  return new Promise((resolve, reject) => {
    // If error message is found, handle it.
    if (otpError) {
      // Set to a variable and display it in a field.
      // In this example, we don't do anything with the error.
      var someErrorMessage = otpError.message
    }

    // Prompt the user for whether they received the SMS.
    // Typically, this is a page that shows the OTP already. We are simplifying
    // it by requiring an input.
    var input = confirm('Did you receive a text message?');
    if (!input) {
      // Close the modal if a text message was not received.
      return
    }
      
    // Prompt the user for the OTP.
    var otp = prompt('Enter OTP code:');
    if (otp) {
      // If the input is valid and the user clicked `OK`, return the OTP.
      resolve({
        input: {otp},  // OTP value
        resultType: 0, // OnSuccess enum type = 0
      });
    } else {
      // Else, exit the flow.
      reject('phone invalid or user cancelled');
    }
  });
}

function instantLinkStartStep(phoneNumberNeeded, phoneValidationError) {
  return new Promise((resolve, reject) => {
    // Since no phone number is needed, don't prompt the user.
    resolve(null);
  });
}