The order object ($arg1) is empty for the callback function of hook_checkout_pane on the operation "view". Can anyone confirm this or why is that?

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Island Usurper’s picture

Island Usurper commented
Status: Active » Closed (works as designed)

When someone first gets to the checkout page, there isn't an order yet, so NULL is passed into $arg1. If someone clicks "Back" on the review page, the order does exist by that point, and it should be used to fill in the #default_values of the checkout form rather than the actual default values. This keeps them from having to fill out all of their information again.