AMX ID
The AMX ID is a first-party identifier designed for publishers using the AMX RTB adapter. For more information please contact info@amxdt.net
AMX ID Configuration
First, add the AMX ID module to your Prebid.js build:
gulp build --modules=userId,amxIdSystem
Then configure the amxId in your userSync configuration:
pbjs.setConfig({
    userSync: {
        userIds: [{
            name: 'amxId',
            storage: {
                name: 'amxId',
                type: 'html5',
                expires: 14,
            }
        }]
    }
});
This will add a userId.amxId property to all bidRequests:
{
  amxId: '3ca11058-ecbc-419f-bda7-b52fe7baf02a'
}