This is the Nextcloud client update server.
Just create a json file in config/ with the name of the OEM that contains the same entries as the config.php.
If the default config.php doesn't hold update information for this OEM, the config is read from the JSON file.
{
"linux": {
"version": "2.3.2",
"versionstring": "Nextcloud Client 2.3.2",
"web": "https://nextcloud.com/install/?pk_campaign=clientupdate#install-clients"
},
"win32": {
"version": "2.3.2.1",
"versionstring": "Nextcloud Client 2.3.2 (build 1)",
"downloadUrl": "https://download.nextcloud.com/desktop/releases/Windows/Nextcloud-2.3.2.1-setup.exe",
"web": "https://nextcloud.com/install/?pk_campaign=clientupdate#install-clients"
},
"macos": {
"version": "2.2.4.1",
"versionstring": "Nextcloud Client 2.2.4 (build 1)",
"downloadUrl": "https://download.nextcloud.com/desktop/releases/Mac/Updates/Nextcloud-2.2.4.1.pkg.tbz",
"signature": "MCwCFGC3X/fejC/y/3T2X+c8ldDk7pJGAhQoR8v6vtvvV57nIcMNePA+jNRYcw=="
}
}