PHP - Web Push Notification - importing subscribers

Currently we run a web push system running in this PHP library.
https://github.com/web-push-libs/web-push-php

Everything works fine - we are able to show the notification client side and then send notifications from the server.
What we want to extend now is the feature of importing subscribers from other Push Services/Companies.

For this we have been told that changing the service worker js file on the client side should help in importing subscribers. We are looking for someone...

PHP - Web Push Notification - importing subscribers

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