All our users are not able to buy in game goods from our F2P app, Soccer Manager 2015 (356370).

The error we are receiving is error code 104: "IP address has been rate limited" and the message the user is seeing

Oops, sorry!
An error was encountered while processing your request:

An unexpected error occured while authorizing your transaction. Please try again.

Can anyone help or advise please?

Thanks in advance