In certain embodiments, transaction data retrieval from a postage vendor system database may be facilitated (e.g., via label generation with multiple barcode representations of a portion of a postage tracking identifier, where the tracking identifier is generated based on a carrier-specific tracking identifier unique within a carrier system with respect to accounts recognized by the carrier system). In some embodiments, the tracking identifier may be generated such that (i) the tracking identifier comprises the carrier-specific tracking identifier and (ii) enables a mail piece associated with a postage transaction to be tracked within the carrier system, and the tracking identifier portion is allocated to the postage transaction in one or more databases of the vendor system. An indicium identifier may be generated to comprise the tracking identifier portion, thereby enabling the vendor system to identify the postage transaction using one of the two identifiers without the other one of the identifiers.