// block product purchase is store is offline or disabled
add_filter( 'wcfmmp_is_store_close', function( $is_store_close, $vendor_id ) {
    $disable_vendor = get_user_meta( $vendor_id, '_disable_vendor', true );
    $is_store_offline = get_user_meta( $vendor_id, '_wcfm_store_offline', true );

    return ($disable_vendor || $is_store_offline) ? true : $is_store_close;
}, 10, 2 );