We were getting the following error since 8:05pm last night when submitting a _POST_ORDER_FULFILLMENT_DATA_ feed. Note that we have been using this API for years now without seeing this error.

Request from Request for type Feed was metered. Feed 108 creation request for merchant XXXXXXXXXXX is metered due to the limit being set to 0. is throttled.

This error persisted for 13 hours and then seemed to resolve on its own. This issue effected a significant portion of our users and generated numerous support tickets.

Even though the issue is resolved, I’d still like to get to the bottom of what that error message means and how we can avoid seeing it in the future.