Free shipping threshold is mistakenly synced as minimum spending threshold

[eason9487]

Describe the bug:

If there is a minimum order amount to get free shipping, it will be mistakenly synced to Google Merchant Center as a minimum spending threshold.

This issue occurs with shipping data obtained from WooCommerce core or set in this extension.

Steps to reproduce:

Using WooCommerce core shipping data

1. Go to WooCommerce > Settings > Shipping > Shipping zones and set up a zone with free shipping and minimum order amount.
   
2. Go to edit free listings.
3. Select the Recommended: Automatically sync my store’s shipping settings to Google option for the shipping rates setting.
4. Add the above configured zone to the Audience setting.
5. Save changes.
6. Wait a moment for the settings to sync to Google Merchant Center.
7. Go to Google Merchant Center and navigate to Shipping and returns page.
8. Expand the corresponding shipping policy.
   • The above minimum order amount of free shipping is set as the No shipping under amount.
   • The Free shipping over amount is empty

Using extension shipping data

1. Go to edit free listings.
2. Select the My shipping settings are simple. I can manually estimate flat shipping rates option for the shipping rates setting.
3. Add a free shipping threshold.
   
4. Save changes.
5. Go to Google Merchant Center and navigate to Shipping and returns page to see the incorrect synchronization.

Expected behavior:

The minimum order amount to get free shipping should be synced to Google Merchant Center as the Free shipping over amount.

Actual behavior:

The minimum order amount to get free shipping is synced to Google Merchant Center as the No shipping under amount.

Additional details:

Related codes:

• https://github.com/woocommerce/google-listings-and-ads/blob/2.7.6/src/Shipping/GoogleAdapter/WCShippingSettingsAdapter.php#L167-L173
• https://github.com/woocommerce/google-listings-and-ads/blob/2.7.6/src/Shipping/GoogleAdapter/DBShippingSettingsAdapter.php#L79-L90

The minimumOrderValue field in Content API for Shopping document:

https://developers.google.com/shopping-content/reference/rest/v2.1/shippingsettings#service

Minimum order value for this service. If set, indicates that customers will have to spend at least this amount.

[tomalec]

I'd like to question the severity of this issue. As if I understand correctly, we indeed use the x free shipping threshold as the "No shipping under" instead of "Free shipping over," but we do so for the shipping group with cost == 0. So logically, it means zero-cost for orders over x.

So, instead of, creating one shipping group:

• "Shipping rate 99.00, free shipping for orders over 987.00"
  We create two
• "Shipping rate 0, for orders over 987"
• "Shipping rate 99.00, for all"

So, both, IMHO, describe more-or-less the same thing. I agree that they are not precisely the same, and it would be better for the merchant experience to create n/2 groups and use that field.

Another thing is that, in API docs, I didn't find a way to specify a free shipping threshold :/

[puntope]

I agree with @tomalec here. Google Service does create a single group for each threshold that is equivalent to the expected behaviour. So I'm setting this as low for now. Feel free @eason9487 to revert this if I'm missing something about the issue that makes it a High Prio Bug.

[puntope]

Tested this a bit more... When I enter in MC and edit the Shipping I cannot set Excluded Value as 0 anymore 😕