It is not possible to complete your integration with Truepush without access to the Control Panel. Get the help of any other person who has access to the Control Panel, place the sw.js file in the root folder and copy the integration code available on your dashboard. This is one of the ways to complete integrating your HTTPS site with Truepush.
If it is a WordPress site, then you can access the CPanel through the plugin manager provided by WordPress for the HTTP site, just log in to the WordPress dashboard and follow the steps in this article: Integrating WordPress Sites.
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