Submitting merchant defined shipping options using Google Checkout direct submission

Is it possible to set the shipping options in Google Checkout without using the server-server submission option?

I'm trying to keep this checkout process as simple as possible (mostly because I do not fully understand the server-server API section), and therefore I'm using the direct submission option in Google Ch开发者_运维问答eckout (details here. scroll down past the code block). So, I'd like to just add the hidden input fields to designate how much shipping will cost, and send it along.

Is this possible?

Shipping options documentation

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It is, in fact, possible. Here's how I did it:

<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.name" value="Delivery"/>
<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.price" value="123.45"/>
<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.price.currency" value="USD"/>
<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.shipping-restrictions.allow-us-po-box" value="false"/>
<input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.shipping-restrictions.allowed-areas.us-country-area-1.country-area" value="CONTINENTAL_48"/>

Tricky for sure, but it works.