Is it possible to make an internal workflow from external button?

Can a click on an external button from example mailer lite start a workflow in my bubble application…

I have maked a bill module where my users can send bills to there customer… and when the user fill out data in there backoffice it generates it as an entry in the database

I have then maked a new page with a clean view of that bill (not editable) so there will be a workflow that when my user creates that bill it will automatically sendt to the customer by mail… in that mail i want a button there says “see my bill now” then i want to redirect them to the page with the clean view of the bill and send the data from there entry to that bill…

How can i make that possible?

If I understand you correctly, this should be possible using url parameters. You will need the button to link to a page whose url would contain some string that you can read using a workflow on that page to trigger any workflow you want. As an example, the url could be www.example.com/extbillview?eid=76887687668x8788978009

Your workflow will then check for the “eid” value to determine whether to execute anything or not. You can set the (series of) workflows you need executed if a condition you set is met.

Hope this makes sense?