Setting Up Your Store > Shipping Settings > Real-time Shipping Calculators > 

USPS

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To set up shipping cost calculation through USPS real-time shipping calculator, follow these steps:

1.If you haven't yet done so, provide your own company address in the 'General settings->Company options' section. Make sure you provide this address correctly - it will be submitted to the real-time shipping calculator as the origin address for all shipments from your store and thus will affect the shipping rates.
2.Obtain an account with USPS (sign up at http://www.uspswebtools.com/).
3.Enable your store to use the real-time shipping calculator provided by USPS:
a)In your store's administration back-end, go to the 'General settings->Shipping options' section.
b)On the 'General settings->Shipping options' page, select the check box 'Real-time shipping calculation'. Unselect the check box 'If selected, use Intershipper calculation services...'.
c)Use the 'U.S.P.S account details' subsection of 'General settings->Shipping options' page to provide the required information.
4.Adjust USPS options:
a)Go to the 'Shipping methods' section of your store's administration back-end (Management menu->Shipping methods).
b)Find USPS in the list of real-time shipping methods and click the Options >> link opposite it. A dialog box with USPS options opens.

c)Adjust the options according to your preferences.
d)Click on Apply.

That is all. Now you can test whether your store can receive real-time shipping rates correctly. For details, see the chapter 'Testing your store's ability to receive real-time shipping rates' further in this manual.