SPDH protocol documentation [closed]

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I seem not to be able to find any documentation on SPDH protocol for POS terminals. It would be very helpful if anyone could point me to some.... Thank you

EDIT: forgot to mention that i did look at this question, but the link to the documentation does not work... An analyzer for SPDH frame

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you can try with this link : http://www.aciworldwide.com/en/Products-and-services/Retail-payments/Payments-processing/BASE24-eps/SPDH-document.aspx

you have to provide credentials and you will be in position to download documentation.

Hope this helped you.