Commerce Bank Account on File

Commerce Bank Account on File provides an API and user interface for storing and reusing bank account data on subsequent orders within Drupal Commerce. The module does not retain full bank account details locally but instead stores the remote ID of the full card data from the payment gateway used to validate and process your bank account transactions. This means bank account on file data will only be good for a single payment gateway; if you change payment gateways or accounts, your stored bank account data may no longer be usable.

You need to apply this patch to commerce_authnet module to utilize this along with Authorize.net's eCheck payment method.