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Parameters in Firebase HTTPS Cloud Features

How to set some parameters in their HTTPS functions in Firebase? I am creating an application, and when I created the application, I was able to increase the mailing list. Now I want to send mail, but I want to make sure that they can unsubscribe before sending anything.

I use Firebase for everything, and I managed to create a function that sends emails for each signed mail.

I can also "unsubscribe" from a specific mail, but this is hard-coded and not an optimal solution.

exports.testUnsub = functions.https.onRequest((req, res) => {
  var db = admin.database();
  var ref = db.ref("mailingList/-KhBOisltrOmv57Mrzus");
  ref.child("subscribed").set(false);
  console.log("-KhBOisltrOmv57Mrzus has unsubscribed from mailing list.");
});

The mail I'm sending has a url that triggers this https feature. I want to set a parameter on this url so that it becomes dynamic. Sort of:

https://us-central1-<project-id>.cloudfunctions.net/testUnsub?listID=xxxxxxxxxxx

I am looking for everything that can help me in the right direction.

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, req res https Express.js .

Request , , query, URL. req.query.name_of_the_parameter.

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