How can I avoid having two login details for my customers

New Member
2 0 0

I'm looking at building a Shopify store to integrate into my existing app, to which customers already have a login. 

If I then put a link to the Shopify store in the app for customers to click on, what is to stop them having to login with a different account when they check out?

I am aware of companies like Multipass, however they are uni-directional, and we need to integrate with them before you can release the shop and any interaction with Shopify needs to come through the app first. 

I know there is the option to turn off login details and have customers check out as guests, but we are looking at doing a subscription service so we would need customers to manage their subscription by creating a Shopify login.

Any thoughts/ideas welcome.