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$WOOCS->is_multiple_allowed

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This is not a function - this is an important variable in the plugin main class WOOCS, and its always shows is 'Is multiple allowed' options enabled or not. Predefined in the plugin settings.

global $WOOCS;
if($WOOCS->is_multiple_allowed){
    //do smth here if 'Is multiple allowed' mode enabled
}

If you want let your customers pay with their selected currency on the front of your site - you should set multiple mode to 'Yes'