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Knocking on the endpoint…
We ask it what it charges, read its catalogue entry, apply the policy, and then ask it again to see whether the price held. That is two round trips to somebody else’s server, so a few seconds is normal and a slow answer is a fact about them rather than about this page.
Walks a whole purchase in the order a buyer asks the questions, stopping at the first that objects. Nothing is signed and nothing is spent. The payment check asks the narrower question, about a payment you have already decided on.
The rehearsal could not be run. That is not the same as it saying no: nothing here objected, and nothing here was established either.