How do I use USPS Priority Flat Rate?

Updated

You can apply USPS Priority Flat Rate to your shipments in ShipStation. To use this service, you must do two things:

  • Enable Package types for Flat Rate options in ShipStation, and

  • Select Flat Rate as the Package type.

Flat Rate packaging will only be available when you select USPS Priority as the Service.

The service drop-down is expanded in the Configure Shipment Widget and USPS Priority Mail is selected as the service.

Then, as long as you have enabled Flat Rate Package types in ShipStation, they will show in the Package drop-down to select when you configure your shipments.

The packages drop-down is expanded and all of the flat rate package options are highlighted.

See the USPS Priority Mail page for more information and restrictions. Additional fees may apply when you add certain shipping options.

To enable USPS Flat Rate Package types:

  1. Go to Account Settings.

    sssettings.png

  2. Select Shipping and choose Packages from the left-hand sidebar.

    Settings sidebar with Shipping section open and Packages section highlighted.

  3. Select USPS from the Manage package types drop-down menu.

    V3_SET_SHP_PCKG_ManagePackageTypes_USPS_MRK.png

  4. Enable the Flat Rate package types you want to use with your shipments, then click Save Changes.

    These options will show in your Package drop-down menu when you select USPS as the Service.

Important

If you try to use the Flat Rate package with a USPS service other than Priority Mail, you’ll get an error. These package types can only be used with Priority.

To ship using USPS Flat Rate, do the following:

  1. Go to the order you want to ship using USPS Flat Rate.

  2. Select USPS Priority Mail as the service from the Service dropdown, then select a Flat Rate option (Flat Rate Envelope, Large Flat Rate Box, etc) as the package type from the Package dropdown.

    The rate card on the order details screen shows the rate for USPS Priority Mail Medium Flat Rate box.
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