How to get confirmation prompt before calling web service?

I have a web service(like jenkins) which I need to call in the end, but I want to show all the data to the user first as Confirmation and if he says ‘Yes’, only then proceed calling the webservice Are there any examples or in documntation

  1. How to generate confirmation prompt and retain the data for subsequent messages. How to change the data if there is a modificaton request?
  2. How to make a POST to a webservice API like jenkins?

Hi @superprg you can do all these things inside custom actions