Shopify is experiencing major login outage on one of the year’s biggest shopping days, leaving merchants locked out of their stores.

Some merchants that use Shopify's platform for online sales say they are experiencing an issue with checkouts.

Launching an online store comes with a lot of excitement — along with a little bit of fear. You have to coordinate a ton of moving parts to bring your store to life, from setting up your website to finding and listing products to marketing and accepting ...

If you've purchased something on the web in the past decade, chances are good you've used Shopify and haven't even known it. The company specializes in custom online point of sale systems, designing seamless checkout experiences for some of the world's biggest brands including Tesla, Lindt, and Hyatt.

Shopify said it had fixed certain issues related to logging in to the online shopping platform that impacted thousands of customers and several small businesses on Cyber Monday.