It is a service that can be used for mixhost services.
Adding funds will automatically apply to your payment when you request a renewal or change plans.
STEP 1: Open My Page.
STEP 2: Open the add funds screen.
Select Add Funds from the menu bar at the top of the screen.
STEP 3: Execution of Additional Funds.
Confirm the additional amount and payment method, and press the "Add Funds" button to execute the fund charge.
The minimum charge amount per charge is 1,000 JPY.
Charged funds are non-refundable.
For information on verifying funds, please look at the article How to check balance (mixhost credit).