Partial is used from EXT:backend/Resources/Private/Partials/MultiRecordSelection/Actions.html

				URL
		{reaction.name}					{reaction.name}


        /{reaction.identifier}

curl -X 'POST' \
    '/{reaction.identifier}' \
      -d '{"my-payload":"my-value","field-b":"my-input"}' \
      -H 'accept: application/json' \
      -H 'x-api-key: ***your-secret***'