What are the options for a seamless checkout from a custom app to Shopify?
Our app will allow users to browse through products but might not allow them to complete the purchase/checkout on our app. Ideally, we'd like to prevent users from having to log in to our app and then log into Shopify to complete a purchase. So far, we have found these possible solutions:
Allow users to purchase with a guest account (although we wouldn't have access to their past purchases afterwards)
Optional account creation
Shopify multipass (seems like a great option, but would require us to upgrade to a Shopify Plus account)
Are there any other solutions that we should take into account?