USPS Addon for Multivendor Dropship User Guide

Multi Vendor Dropship needs carrier-specific wiring for USPS. This guide covers the USPS Multivendor Addon ($199): connecting vendor shipments to USPS rates and fulfillment workflows inside Magento checkout.

Buy USPS Multivendor Addon — $199 → Full wiki docs

For deep install screenshots and edge-case config, see the detailed wiki documentation. Product details and add-to-cart live on the USPS addon for Multivendor Dropship page.

Why USPS Needs a Multivendor Addon

Generic Magento USPS modules often assume a single ship-from. Multivendor carts need vendor-aware USPS quoting:

• Single-account assumptions — rates ignore vendor warehouse origins
• Checkout gaps — dropship engine enabled but carrier addon missing
• Ops mismatch — labels/tracking not aligned to the vendor that owns the SKU

What This Extension Solves

The USPS addon for Multivendor Dropship connects vendor shipments to USPS rates and fulfillment options inside the dropship workflow.

• USPS rate collection for vendor-mapped products
• Works with Multi Vendor Dropship warehouse origins
• Checkout/admin paths consistent with other carrier addons
• Wiki deep-dive for credentials and service allow-lists

Key Features

• USPS integration for multivendor dropship carts
• Vendor-aware shipment workflows
• Configurable services / credentials per your Magento scope
• Magento 2.4.x compatible

System Requirements

• Multi Vendor Dropship core installed and configured
• Active USPS API / account credentials
• Magento 2.4.x + PHP 8.1–8.3

General Composer install steps for Towering Media modules: Installation guide.

Installation Overview

Step 1: Authenticate Composer

Add your Towering Media credentials to auth.json in the Magento root (same pattern as other Towering Media extensions).

Step 2: Require the package

composer require toweringmedia/module-usps-multivendor

Run this from your Magento root with your Towering Media Composer credentials in place.

Step 3: Enable and upgrade

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f
php bin/magento cache:flush

Enable the module(s) listed in the package module.xml / wiki if your package uses explicit module:enable. Production stores should follow your normal deploy process. Need help? Contact Towering Media or browse Magento 2 Extensions.

Configure in Admin

1. Confirm Multi Vendor Dropship is enabled and vendors have warehouse addresses.
2. Install/enable the USPS multivendor addon.
3. Enter USPS credentials and allowed services.
4. Map test products to a vendor and request rates in cart/checkout.
5. Place an order and confirm shipment/tracking paths for that vendor.

Open full wiki guide →

Validation Checklist

1. Vendor product returns USPS options when only this carrier is intended.
2. Non-vendor products do not incorrectly inherit vendor origins.
3. Order creates expected shipment records.

Troubleshooting

• No rates: verify core dropship + addon enablement and vendor mapping.
• Auth errors: rotate/re-enter USPS keys; see wiki for OAuth/REST notes.
• Wrong warehouse: check vendor origin address and product assignment.

Frequently Asked Questions

Do I need this if I only use USPS?

Yes if you run Multi Vendor Dropship and want USPS vendor-origin rates. Single-warehouse stores may use a standalone USPS module instead.

Can I combine FedEx, UPS, and USPS addons?

Yes—common for marketplaces. Validate mixed carts carefully.

Related Extensions & Resources

Also useful: Installation · All Magento 2 extensions · Contact support.