Listen to a web hook and create a contact from a web hook.
You can’t do it directly. Mautic doesn’t accept webhooks without a Plugin.
However instead of envoking a webhook you can make a proper API call and create a contact.
OR you can create a form in Mautic with the fields you want and post to that form:
Thank you for this clarification.
Is there any way to call a webhook with JSON payload?
Not sure what you are asking.
Which language are you using?
Here is an example, with a webhook already.
I want to push contacts of a campaign to my billing system that accepts webhooks with JSON payload.
Then you need an intermediate step.
Use webhook action in the campaign builder.
Create a script on your server, that accepts Mautic payload and send it further.