What is the best and safest authentication strategy to support Gupshup(WhatsApp) and my own Business API integration? We independently support JWT/Oauth based authentication on our API, but in case of WhatsApp Integration, we will just have a phone number and not a user ID & password.

I know that we can send a text message using HTML anchor tag, with the following code:

<a href="whatsapp://send?text=Hello%20World!">Hello, world!</a>

or <a href="https://web.whatsapp.com/send?text=Hello%20World!">Hello, World!</a>

But, now if I want to send an image attachment, how can I do that?

I was trying to create a AWS stack to deploy Whatsapp Business client API. But Creating stack throws following error. error: The following resource(s) failed to create: [KMSKey, MountTarget2, MountTarget, lambdaStack, dbStack]

I followed this documentation steps. https://developers.facebook.com/docs/whatsapp/on-premises/get-started/installation/aws

In the official Whatsapp Business API documentation, there's a 'context' field that indicates when a user is replying to a message.

How do get this field from the Twilio API?

I have been trying to send Whatsapp messages using cloud API, but its expecting to enable Whatsapp_business_messaging permission which is by default disabled when associating with any app that has been created.

https://developers.facebook.com/docs/whatsapp/cloud-api/get-started#get-access-token.

I didn't find any documentation pertaining to enable the above mentioned permission. Kindly assist.