Supply Chain ID A Supply Chain ID (SCID), coupled with an item reference number, is what gives a mailpiece uniqueness in Royal Mail's network In a 2D datamatrix it is a randomly generated 7 digit number In a 4 state barcode it is a randomly generated 6 digit number If both 2D and 4 state barcodes will be used against the same supply chain, then two SCIDs will be required A SCID represents a unique combination of 4 Participant roles: -Mail Originator -Mail Producer -Carrier -Bill Payer 2
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