To show USPS rates only when customers select shipping in our widget, we recommend integrating USPS in the Rates tab of Zapiet - Pickup + Delivery.


  • You will need to have an active USPS account and your username.

    • Log in to the USPS Developer Program website using the username and password for your USPS Solutions for Small Business account. Select your account number from the dropdown list.


  • For any questions about the rate value, please contact USPS—we only show the rates they generate.

  • Zapiet - Pickup + Delivery does not have the ability to show discounted Shopify rates—only Shopify can offer discounted rates. However, if you integrate USPS in Shopify, the rates will show for all of your checkout methods, as Shopify isn't aware of the methods selected in our app.

Enable USPS rates

  1. Go to Apps, and then click Zapiet - Pickup + Delivery.

  2. Go to the Rates tab.

  3. Go to the Shipping section and click Advanced Options.

  4. Find USPS and click Add carrier.

  5. Enter your username and tick Enable USPS rates.

  6. Add handling fees if needed, and click Save.

Your USPS rates should now be generated through Zapiet - Pickup + Delivery when your customers select shipping in the widget—you can now test them.

Disable shipping rates

If you have added shipping rates in Zapiet - Pickup + Delivery, we recommend removing them so you can only show USPS rates.

  1. Within Zapiet - Pickup + Delivery, open the Rates tab.

  2. Within the Shipping section, click Edit next to your shipping zone.

  3. Click Delete zone.

  4. Confirm to delete this shipping zone.

Your Zapiet - Pickup + Delivery shipping rates are deleted now, and the only rates generated for shipping will be coming from USPS.

Prevent duplicate rates

When your USPS rates are generated through Zapiet - Pickup + Delivery, we recommend removing USPS as the carrier from Shopify shipping and delivery settings.

  1. Go to Shopify Settings and then Shipping and delivery.

  2. Under General shipping rates, click Manage.

  3. Delete USPS as a carrier if it's added to your domestic shipping zone.

Only Zapiet - Pickup + Delivery should be added as a carrier under your domestic shipping zone. Then, our app can control which rates to show at checkout, depending on the checkout method selected in our widget.

Disable USPS rates

If you want to stop using USPS with Zapiet - Pickup + Delivery, you can disable the rates.

  1. Within Zapiet - Pickup + Delivery, open the Rates tab.

  2. Find USPS integrated under the Shipping section, and click Edit.

  3. Untick Enable USPS rates.

  4. Click Save.

USPS rates will no longer appear when selecting delivery or shipping in our app.

Make sure to add your delivery and shipping rates within our app or Shopify, so that your customers can check out. You can take a look at our Rates setup guide for more information.


If you're not seeing USPS rates:

  • Check if the correct credentials are added—make sure you're adding the correct username from your USPS account.

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