For those of you who are trying to checkout even through Shopify is down, simply turn WiFi off on your iPad and that will force the Shopify POS app to enter offline mode. You can't process credit cards while it is offline, however it will let you do cash transactions.
Would love to see Shopify fix this as the exact thing happened during one of the last big outages.
That's really odd-- it is working for all our systems. Perhaps Bluetooth was turned off instead of WiFi? Also make sure that Wifi is turned off, not just disconnected from a network.
Depending on the iPad version, either swipe up from the bottom of the screen and make sure the Wifi icon is white (disabled), or if it is a newer iPad, swipe down from the upper-right hand side and the WiFi icon should be white (disabled).
@John24 : quick question about the proposed WiFi workaround. Say that WiFi is disabled and Shopify POS can still sell stocked items against customer using cash as the payment method. When Shopify POS is online again, will those offline transactions automatically sync up with "the cloud?"
UPDATE: I just tested this out, and found that the offline test transaction I rang indeed synced up once I turned WiFi on again. Looks to be a good workaround. The iPad had Shopify POS up and logged in while I had good WiFi connectivity. I only disabled WiFi once I was "in" the app. That might explain why it didn't work for others. The initial app launch and login probably syncs up with the cloud to pull products, validate PIN's, etc.