Use API Firebase Cloud Messaging (V1) in PHP

I want to send push notification in PHP through Firebase. The tutorials I've found on the web use the legacy API Cloud Messaging (like this one https://gist.github.com/rolinger/d6500d65128db95f004041c2b636753a#file-gistfile1-txt ). So, I'm seeking a tutorial step by step explaining how to use API Firebase Cloud Messaging V1 in PHP

Thanks in advance for your help

source https://stackoverflow.com/questions/71621794/use-api-firebase-cloud-messaging-v1-in-php