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Understand MERLIN™ program reports.
MERLIN performs a number of verification procedures, each of which generates a report detailing relevant information about the mailpiece. The categories and their associated reports are as follows:

Presort Verification – verifies the sortation composition of discounted rate mailings.

U.S. Postal Service® Presort Verification Record PS 2866X
Sortation Exception Report

Barcode Readability – performs barcode quality analysis.

Automation Rate Barcode Readability Report
Automation Rate Barcode Components Report
Barcode Error Listing Report
Automation Rate Adjustment Worksheet Report
Barcode Exceptions Report
Barcode Digit String Report

Mailpiece Characteristics Report – verifies height, length, thickness, weight, and aspect ratio to make sure mailpieces are eligible for rates claimed.