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When it happens

POST /v1/trademarks/batch was sent without Content-Type: application/json, for example as a form.

What to do

Send a JSON body with Content-Type: application/json, such as {"ids": ["tm_AD_2376e41e-3d24-57e3-af6f-6a176f9985ba"]}.

Example

Body
See the errors catalogue for every error type, and Handling errors for retry strategy.