post https://api.nexiopaysandbox.com/pay/v3/saveECheck
Allows you to securely save bank account information without a browser using the API or using your own form.
You may save a new e-check by including the card object or add existing TokenEx e-check token for use in Nexio by including the token object.
Note: Processing options must be sent in the request for a one-time-use token.