Lightspeed retail and webshop on non-lightspeed platform

Hi,
Do any of you have a retail installation with a webshop which is not the lightspeed ecommerce solution (e.g. running on magento, prestashop, ... )
How do you manage to keep track of you sales in the webshop especially concerning inventory allocation before is actually send out to the customer ?
Any feedback is welcome !
Do any of you have a retail installation with a webshop which is not the lightspeed ecommerce solution (e.g. running on magento, prestashop, ... )
How do you manage to keep track of you sales in the webshop especially concerning inventory allocation before is actually send out to the customer ?
Any feedback is welcome !