Welcome to the community.
The start and end parameters can be passed in via the query string. The snap can take care of that for you. You’ll have to make a couple changes.
You’ll need to modify the Service URL to include everything up to the question mark, eg. https://elastic.snaplogic.com/api/1/rest/public/runtime/abc123
Modify the Query parameters to so that the left column, which is the query parameter key, looks like start and the left could look like _START.
Then you’ll need to modify the Pipeline so that it has a Pipeline Parameter called START.
Do steps 2 and 3 again for the end query string parameter.
To make your pipeline dynamic, you could look at this documentation for more information.
