This API endpoint redirects the visitor to a form where s/he can join the community of a website. It’s like registering on the site.
domain - the domain which to join. Example: domain=example.comreturnUrl - the URL where to be redirected afterwards. Example: http://example.com/page?foo=barhttps://boomla.com/api/v1/join?domain=example.com&returnUrl=http%3A%2F%2Fexample.com%2Fpage%3Ffoo%3Dbar