How to access Customer Language Object?

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I have a multilingual shop and would like to automatically tag my customers based on what language they are visiting my store, so the data could be sent to klaviyo.

I can filter my customer list by language through the shopify interface, however when I look at tagging apps or the shopify api I can't seem to access the customer language attribute.

Any suggestions ?

New Member
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I am also having this issue, we want to send out invoices to multilingual customers, but the invoice language only changes if the customer has already placed an order, and acquired a "customer language attribute"

We have no idea how to manually add a language to a customer, otherwise our only solution would be to buy a fake product with the customers' email, so it is in the system. That is obviously a massive pain.