There is more a better version here : https://extensions.gnome.org/extension/1344/azan/ or https://github.com/fahrinh/azan-gnome-shell-extension

An extension for Gnome Shell. Get international Salah (Islamic pray) times and notifications.

Time APIs are gotten from http:https://muslimsalat.com/api/ Get API Key from http:https://muslimsalat.com/panel/signup.php change the option from the "extension.js" from this line

let stOptions = {
    location: null, //auto detect
    times   : "monthly",
    daylight: null, //auto select
    method  : null, //auto select
    api_key : "xxxxxxx"
};

Not available at gnome extension yet. To use copy the project to ~/.local/share/gnome-shell and activate from gnome tweak tool.