Direct Deposit via Authorize.net's eCheck.net API in Java

How do I start, if I'd l开发者_Go百科ike to write spring online application that would depositing money from business bank account to customer bank account.

It is the common scenario where you keep balance for customer and when they decide to withdraw they can opt for bank account deposit.

I'm looking for something in Java. Examples and real open source project usage would be greatly appreciated!

UDPATE:

As hinted in comments Automatic Clearing House or ACH (aka Electronic Funds Transfer or EFT) is something I would be very interested to see in Java API example or project.

How do you create ACH or EFT with Java Authorize.net's eCheck.net API ?

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If you're interested in concurrency problem in this example see "Java concurrency in practice", some interesting aspects of this problem are reviewed there. If you're searching for technology see JTA and Spring transaction API.

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I think by looking at Authorize.Net (or other payment gateway) you will be able to find what you are looking for. The actual API is going to be different for each gateway, there are dozens.

Sample Code: http://developer.authorize.net/downloads/samplecode/