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The result code is two bytes long. The bottom two bits of the first byte are flags. If the zero bit is set, it means there was "advice." If the 1 bit was set, it means there was a "reversal." E.g.: 0203 means there was a reversal (02) and the result was 03 (declined).
In newer products (e.g. VP4880VP3300, but also Augusta in Quick Chip Mode), the two-byte result code will appear as the value of tag DFEE25. The possible values are as follows:
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