Allow from internal server

My backend application is hosted in a private cloud. The backend is written in PHP and uses the expo-server-sdk-php to send notifications to apps. The API is able to send notifications when running locally, but when I deploy the API to the private cloud the endpoint that sends notifications hangs the entire backend.
The backend API/server doesn’t have access to the internet except when calling URL. When looking at the network logs, there are URLs like time.cloudflare, and other google static content URLs that are being dropped by the firewall.
Is there a list of URLs which I can whitelist/allow when calling so that the request gets completed?

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