The email channel requires a smidge more setup but all of the instructions are outlined in the documentation. You can use this as a basis to send and check verifications in your own application for sign up, login, or step up authentication like at checkout. International telephone input ( more details in this post).This application gives you the following building blocks: This application doesn't actually protect anything (yet!), but if you're like me, you love having code to copy and modify. How to use the Verify OTP Quick Deploy application Fortunately, WhatsApp does not charge for failed message attempts to accounts that don't exist while SMS does charge carrier fees for undelivered messages. While you can detect whether the WhatsApp application is installed on mobile, WhatsApp does not have an API to determine if an account exists prior to sending a message. Unfortunately not every user has a WhatsApp account. The Service Name will appear in the SMS body but you can always edit it later A Verify Service which you can create in the Twilio console.A Twilio account for sending the WhatsApp message.Prerequisites for sending One-Time Passcodes This blog post will show you how to quickly spin up an OTP dashboard and start sending and checking WhatsApp verification messages. Best of all, by using WhatsApp through the Verify API, you do not need a separate WhatsApp Business Account. Since WhatsApp does its own phone number verification at sign up, you can use WhatsApp verification to directly replace SMS verification. That's why we added support for WhatsApp in our Verify API. SMS one-time passcodes (OTPs) are a popular form of phone verification and two factor authentication (2FA), but in some countries like Brasil, Germany, or India, messaging apps like WhatsApp are more popular than SMS.
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