Introduction to the Manhattan EPI

Manhattan Associates Inc. (hereafter "Manhattan") develops software solutions designed to manage supply chains, inventory and omni-channel operations. Through its Warehouse Management for Open Systems (WMOS) solution, Manhattan allows retailers and brands to fulfil orders from distribution centres across the world.

This guide describes how you can use Manhattan's External Parcel Integration (EPI) to generate Metapack labels in the 2019 version of WMOS.


The guide assumes that you are familiar with the 2019 version of WMOS.

The Integration is also compatible with the 2017 and 2018 versions of WMOS, but not with earlier versions.

The Manhattan EPI adapter takes messages from WMOS transactions and converts them into calls to Metapack's Delivery Manager. It then decodes the responses from Delivery Manager before returning the data to the calling transaction to update the WMOS 'oLPN' and print the label(s), if any, returned by Delivery Manager.


In WMOS, a single-parcel order is assigned an 'oLPN', which is a Manhattan-specific term for an outbound shipping carton. If the order is split into a second parcel, then a new oLPN is assigned.

How can the EPI help Manhattan's customers?

With the EPI, Manhattan’s customers have instant access to Metapack's library of almost 5,000 home delivery services from over 400 carriers. They can add these carriers and services quickly and easily with a fully compliant label library using a universal label format.

How can the EPI help Metapack's customers?

If you are a Metapack customer, then using 'pre-built' adapters such as the one described here, provides maximum flexibility, allowing you to move easily and quickly between different OMS and WMS providers.

In addition, implementation costs are reduced in that you do not need to pay for your own customised integrations.

The particular advantage of Manhattan's EPI is that you can use their omni-channel solution to ensure that Consignments are quickly picked and packed to fulfil consumer promises.

Getting Started

Before you can use the EPI, both Delivery Manager and WMOS require some administrative setup. The steps are as follows:


With regard to the specific EPI setup (steps 2-4 above), the guide assumes that you either already have the required administrative privileges in WMOS or are in touch with Manhattan's Support team (you can contact them here).