When a major update is released, the version is incremented and this becomes available on the billing page. You are not automatically put on the newest version as these can present changes that could cause unwanted changes. These changes will usually be style related. Make sure to test out version updates before changing your production billing page.
If you are looking to test out new functionalities or views with your current integration to make sure they do not break your existing set up, follow the steps below. Updates are pushed to a beta url, so just changing that url on your embed snippet.
In the Billflow embed snippets you will see a line where the source is pulled in
s.src = 'https://js.billflow.io/billflow-embed.js';
Change that to the following beta link to test out the newest release.
s.src = 'https://js.billflow.io/beta/billflow-embed.js';