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<mvt:assign name="l.header" value="miva_output_header( 'Content-type', 'application/json' )" />
<mvt:assign name="l.header" value="miva_output_header( 'Content-Disposition', 'attachment; filename=orders.json' )" />

<mvt:do file="g.Module_JSON" name="l.null" value="JSON_Output( l.settings:admin_order )" />