How to authenticate with SMS/whatsapp in MAUI App

Question

Hello everyone. I'm developing mobile app in MAUI. Everything (db, API, etc etc) is on Azure. I wonder if there's an Azure function that allow developers to authenticate user of my app through SMS or whatsapp. So I would like to

• open app and allow user to insert his phone number
• send this number to service that send a code through whatsapp or SMS
• send this code to a service that give me a simple response (for example accepted for the right code or denied for the wrong code)

I searched a lot on web and on Azure documentation but I'm so confused that I need to know which service I have to use for my goal. Any idea?

Answer 1

your web server just needs a SMS gateway.

• your maui app call the web service with the phone number
• your web server generates a key and sends via sms and returns an encrypted token to the caller
• your maui app has the user enter the ssm key value, and send it and the token to webserver
• you websever validates the key and token and returns an authenication token to be used with api calls

note: WhatsApp is pretty closed, the user will need to forward their sms messages to WhatsApp.