What I mean is from attacking from hacker like DOS.
I start intern at startup company, my job is to develop a food delivery application. Right now, I'm using firebase with flutterfire package to authenticate and send data. I allow authentication by Anonymously(<-this method is where I concern, can someone DOS by create new UID rapidly?), Facebook, Gmail and AppleID.
I also need to send sensitive informations like credit card and address to store on server. Is there any security risks that I should concern?