API returns blank response after installing & uninstalling WP-rest-api plugin

Uninstalling and reinstalling all plugins revealed the answer, which I recommend as the first step for addressing this sort of problem.

The problem was apparently due to a conflict between WC-Vendors and another plugin which declared the same class WC_Email_Notify_Shipped. So I disabled WC-Vendors, which we weren’t using at the time.

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