I want to Send a Text message or Image or any documents through Whatsapp using my grails application. Is there any solution ?

When you begin your business using Twillio for sms verification is pretty expensive, I was looking for a free/very cheap service for the beginning.

I can see that Facebook provides - Whatsapp business API and it's unclear if you can already use it to send messages as an individual developer. https://developers.facebook.com/docs/whatsapp/

I can see that Twillio also have a Whatsapp API which costs money.

Is there a way to send Whatsapp messages today ?

Is there other affordable choice to verify new users by sms ?

I am trying to understand something about WhatsApp group messaging API for businesses. The question is: In order to send a message to a group as a business, does my business user have to explicitly be a member of that group? In other words, I want to create a group with a few of my customers via the API, but to post messages there without the need to have my business user to be explicitly listed among the group members.

I went over their official docs: https://developers.facebook.com/docs/whatsapp/api/messages/group/ https://developers.facebook.com/docs/whatsapp/api/groups/

I also read this post (on which I would comment - if I had enough reputation) : How to send message on WhatsApp Group using official API

I didn't find an answer on this question there. Does anyone know?

Thanks :-)

I have searched for the Whatsapp Business API but not found the official Whatsapp business API samples. What are the limitations of media messages and billing. If any one have information please provide.

I'm trying to follow this guide to start business initiated conversation in WhatsApp. I successfully created the user in the first step, but I cannot link it to the WhatsApp channel.

I'm calling API POST request:

https://api.smooch.io/v1.1/apps/{myAppID}/appusers/{myUserID}/channels 

With body:

{     "type":"whatsapp",     "confirmation":{"type":"immediate"},     "phoneNumber":"phoneNumberInInternationalFormat" } 

But result is:

{     "error": {         "code": "bad_request",         "description": "Linking not supported for whatsapp sandbox integrations."     } } 

So my question - is there any way to send a message using Sandbox number, or I need to register a number by requesting access process?