Also, where is the documentation to the "event" tags and variables?

Do we need to add an @ or {{}} to the event.tags.conversation['whatsapp:userPhone']? How ca nwe test this?

For the tags available you can check the

integration.definition.ts

file of our integrations which are open source and located here: https://github.com/botpress/botpress/tree/master/integrations

For example, for "message" tags just locate the

channels.channel.conversation.tags

node in the integration definition's code, where you'll see the tags available, which you can access through

event.tags.conversation

in the bot, the key is the integration name (defined at the top of the integration definition in the name property) followed by a colon and then followed by the tag name itself.

So in your bot, if you're using an Execute Code card you can simply use

event.tags.conversation['whatsapp:userPhone']

But if you want to insert this in a text input of a card in the Studio, you need to use it as a

{{ }}

expression, for example:

Hello, your number is {{ event.tags.conversation['whatsapp:userPhone'] }}