AuthorizeNet: E00104 Server in maintenance.

What This Means

The payment request failed because Authorize.Net's servers were unavailable due to maintenance. This is usually a temporary issue. If the issues persist, you will need to contact Authorize.Net's support for more information.

Suggested Next Steps

To avoid a duplicate transaction, first, check within your Authorize.Net gateway for a processed payment for this Scheduled Order using the GatewayCustomerID.
You can find the GatewayCustomerId in QPilot Merchant Center > Dashboard > Scheduled Orders >> Payment Method, then read the payment method description.
You can find the transaction in Authorize.net by searching in Reports >> Transaction Detail Reports or Search >> Suspicious/Unsettled transactions.

After Resolving The Issue

If the payment was successful, you may Completing Processing
If the transaction was not paid successfully in Authorize.Net, and you wish to retry processing the payment, you can Continue Processing the Failed Scheduled Order