Building an App to Login customer

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I am building a listed public app that shop merchants can install to allow their customers to login via another service and are then redirected to the merchant store. Similar to Facebook Social Login. From reading the documentation it looks like Multipass is the correct feature to use here? I assuming apps like or use multipass for this? 


I ran into a couple of issues getting this to work in my development store. I'm assuming it is because I don't have a Shopify Plus account. However, I am building and testing so I would rather not pay for Shopify Plus during this stage of development.


Is Multipass the correct feature for me to use? I'm expecting merchants to specify their multipass token when configuring/installing the app.