Prevent Enumeration/Account testing VISA/Master Card

[nhatdigitalbank]

Dear Spotify AB,

As I monitor your Websites and Mobile Application when a Sotify AB and Sotify user want to become premium account by link to  credit cards (VISA/MasterCard/Ammerican Express) at your websites/Spotify Mobile application. But your system did not set up the number of attempts, that why fraudster can try many times to detect VISA/Master Card by using brute forcing attack.

So kindly have a solution:

1/ Block SOTIFY Accounts if they try to use brute force to detect valid credit card 2/ Implement CAPTCHA to prevent them try input different Card Information by automatically or scripting tool.

Link websites https://www.spotify.com/us/purchase/offer/default-trial-1m/?country=US 

User can try many times with different cards.