Can keyboard-only shoppers complete your Shopify checkout?
Many Shopify stores look fine and still block keyboard-only shoppers at checkout. The usual culprits are custom payment buttons, address autocomplete widgets, and error messages that never get announced. Test the full flow with a keyboard before assuming it works.
Walk the whole flow without a mouse
Start on a product page and go all the way through purchase: add to cart, open the cart, reach checkout, fill in contact and shipping, choose a payment method, and place the order. Everything must be reachable by tab, operable with enter or space, and visible while focused. Pay special attention to anything the theme customized. Stock Shopify checkout is decent; the breakage almost always comes from apps and theme overrides layered on top of it.
Watch the payment step closely
Express payment buttons, saved-card selectors, and buy-now widgets are frequently built as clickable divs with no keyboard support. If tabbing skips right past the payment method you intended to select, that is a lost sale for a keyboard user and an accessibility failure. The same goes for address autocomplete: if suggestions appear but cannot be arrowed through and selected, the widget is decorative for keyboard users.
Errors have to be announced
Submit checkout with a bad card number or an empty required field. The error must appear as text near the field, and focus or an announcement must tell the shopper something went wrong. Silent red borders and error summaries trapped at the top of a long page both fail real users. Test with a screen reader if you can; if not, at least confirm focus moves to the first error.
Fix the flow, then monitor it
Checkout is the worst place to discover a barrier because it costs revenue directly. Fix what the keyboard walkthrough finds, then re-test after every theme or app change, since checkout customizations regress often. Continuous monitoring exists for exactly this reason: the store that passed in September can break in October with one app update.