Trying to get arduino to react to data other than tag serial number

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Indeed, good one. Didn't think about the existence of such huge variables. Not often that they're used.

So

char targetUID[9] = {0x04, 0x08, 0x7A, 0xFE, 0x04, 0x04, 0x15, 0x45, 0x00};

then becomes:

uint64_t targetUID = 0x04087AFE04041545;