Hey there,
Trey here from Shopify!
It should be possible to use the API to grab customer information such as the Customer IDs, feel free to check out our API doc that covers this in a little more detail here, specifically, you can try a GET for /admin/customers.json which would give you a list of all of your customer IDs.
You can also find a customer ID for individual customer accounts through the Admin area of your shop, within the Customers tab. When you click on each customer account, the URL will contain the customer ID of that specific customer as well.
Trey S
support@shopify.com
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