After successfully calling this endpoint, your attributes and associated values will continuously sync with the specified destination. The first time an attribute is synced from ModernLTV to a destination, ModernLTV will always generate a new attribute with the prefix modernltv. With every subsequent sync, ModernLTV will check is the attribute value has changed and if so, it will automatically refresh the modernltv attribute. ModernLTV will never override existing data fields in a destination.  You may disable the sync at any time in your Data Manager by going to the specific attribute or destination. ModernLTV