[kristopher]

For those who had a hard time finding the official information, I will repost it here:

  Brian Alkerton
  Shopify Employee
  
  Hey Everyone,
  
  Just a quick update on this: our Bitpay integration is feature-complete and can be added to your store now.
  Due to the fact that it's a very new feature and not something we're ready to roll out to all stores just yet,
  you will need to contact me to have it enabled, and I may want to follow up with you for your feedback once
  you've been using it for a while, but it works. When active, Bitpay will appear as a credit card processor
  in the Checkout page of your shop admin - enter your access key and you'll be all set to go.

  One caveat: at this time, Bitpay functions in the same way as the other credit card processors on Shopify,
  meaning that you can't use Bitpay in conjunction with Authorize.net, Stripe, or other credit card processors.
  PayPal Express Checkout can be used as a secondary option with Bitpay in the same way it can be used with all
  other gateways.

  To activate, email me your shop URL at [e-mail] and I'll do my best to get everyone up and running promptly!

[krrrh]

  One caveat: at this time, Bitpay functions in the same way 
  as the other credit card processors on Shopify,
  meaning that you can't use Bitpay in conjunction with 
  Authorize.net, Stripe, or other credit card processors.

This is so half-assed, and frankly sort of typical in terms of the strange limitations that Shopify saddles you with (similar to how it took them 5 years to fix their database so you could modify a shipping address as a merchant). Sure, it would be fun to have a button that allows a customer to pay with bitcoin if they want to or are able to, but how many merchants would forgo credit card processing in favor of bitcoin? This "feature" is link-bait, and nothing more at this time.