Need help connecting Shopify API to my client's website

Hello!

My client has a website where only members can login. Once they’ve logged in we plan to put a link in the members section where they would then be led into our exclusive Shopify Store.

The challenge is how do we carry over the member details (Name, Member ID, etc.) from my client’s website to the Shopify Store so that once they’re in the store they’re automatically logged in and we can track if they’ve visited or not.

And assuming that they’ve purchased, how can we send the data back to my client’s website to confirm that the user has purchased?

I believe, in the case where you are providing an integration for a Shopify Plus merchant, you’d want to look into using Multipass.

Cheers.