Shipping methods are set up in the "Shipping and delivery" settings in Shopify. Shopify allows you to control which methods are shown to customers by location, shipping zone destination, and by cart conditions.

Starting with your shipping methods:

Verify that any custom rate profiles setup comply with Airhouse shipping methods.

When Shopify is determining which shipping method conditions apply to an order, the total weight of all of the products in the order and the default packaging weights will be used. Note that this can cause unexpected behavior if package weights are being added to an order on top of product weights regardless of the packaging being used.

In most cases, package weight in Shopify should be set to zero or as light as possible if dealing with products that qualify for USPS Ground Advantage.

Once the methods are configured, we recommend placing a test order (keeping in mind price, or destination and weight depending on your conditions) to see which shipping method your customers are offered in the cart.

You can see which shipping method was selected on orders that have already been placed along with the Shopify calculated order weight (weight of items + packaging).

In order to select the same options already set up in your Shopify shipping settings, make sure you have a valid customer address entered before selecting the "Add shipping" option.

There are multiple things that can affect what options appear during checkout.

The most common causes are:

Shopify Shipping Profiles

Shopify Locations