checkout error fixes

Organic search results in the Shopify App Store

Rank		App
#1		Checkout Plus
#2		Blockify Checkout Customizer
#3		Shopify Checkout Blocks
#4		Checkout Components
#5		BoomGate: Checkout Validation
#6		Redirect Hero ‑ Fix 404 links
#7		Checkout Rules & Discounts
#8		SMART Checkout Rules & Upsells
#9		Checkout Links
#10		Payflow: COD & Checkout Rules
#11		Simesy Checkout Rules
#12		Account & Checkout Blocks
#13		King Checkout Validation
#14		BeSure Checkout Rules
#15		Discount Mix: Volume discounts
#16		Essential Checkout Customizer
#17		Kedra Checkout Rules & Upsells
#18		Patrol ‑ ADA Code Level Fixes
#19		Mix and Match Bundle Builder
#20		CartGate: Checkout Rules