Drupal 8.x

When creating a custom form, I learned that adding a service to a form via dependency injection should be done like the below using the constructor....

Hi! I would like to add links that have prefilled base url’s, for example:

www.twitter.com/
www.youtube.com/
www.instagram.com/

and then the field next to it is where the user can add the username.

The result to be for example:

www.twitter.com/username

This is so users do not add incorrect url’s and need their usernames in a view.

Most appreciate any suggestions on how to do this 🌷

Dear all,
Here's something I have been struggling with for months.
When I run 'Cron' via Configuration > Cron, this is what I get:

We had installed SSL certificates in my Drupal project in AWS server, the website works fine with https. In this site we had configured our custom wallee module which is using Drupal Wallee SDK for payment transaction related functions. But while trying to initiate a new payment transaction below SSL certificate problem is triggering.

error setting certificate verify locations: CAfile: /var/www/html/walle/vendor/wallee/sdk/lib/ca-bundle.crt CApath: none

THe site worked fine in ddev. I updated it via composer and it works just fine.

THen I exported db via CMD and zipped files and uploaded them via filemanager to fresh new folder on live server.

I also imported db in new site. I inserted new database and user in setting.php and tried to open the site. 

THe site does not want to open at all. Nothing helps.