I need 'customer_id' to synchonize our DB and Shopify Data. And Also I have to use Shopify's Multipass.
But There is no way to get 'customer_id' via Shopify's Multipass Login.
So I tried to create new register via Shopify Admin API with multipass_identifier, and got 'customer_id'.
And then I tried to login via Shopify's Multipass with identifier. As a result, I got a error which is 'duplicated email'.
If I tried to login via Shopify's Multipass without email, I got a error that there is no email.
In Multipass Login Guide,
Some of my customers have already placed orders on Shopify. How do I update those customers so they can login through multipass?
You can use the Customer API to set the multipass_identifier for the customer. You will need to use the identifier with all your multipass requests for those customer accounts
How to use Multipass login with existing customer???
