The PWA point-of-sale (POS) solution, based on multi-source inventory (MSI), is the next big thing in the field of the O2O approach of sales. This handy revolutionary POS solution is a boon to all small to big vendors who want to go for off-line sales with the existing online website. We have leveraged Magento's MSI feature in POS so we can create separate sources for POS and website. This comes in the PWA package, so it can be used on desktop, mobile and tablet. Using this solution, SMEs can also have ready-to-use web-based POS without any large scale infrastructure.