The client gets an exception similar to:
ReplyError: ERR max daily request limit exceeded
Your database exceeds the max daily request count limit which is
10000 for the Free Tier(
2500 for Global).
You can refactor your application to send less number of commands.
You can upgrade your database to pay-as-you-go plan by entering a payment method. When you entered your credit card, your database will be upgraded automatically.
See here for more information.