Can “Language to use when you send invoices” be updated via API or Zapier?

Hi everyone,

I’m trying to automate customer creation in QuickBooks Online through Zapier, and I need to set each customer’s invoice language to either English or French. QuickBooks Online supports this in the UI under the customer’s Payments section, using the field “Language to use when you send invoices.”​

However, when I read a customer through the standard Customer endpoint, I do not see any language-related field in the response. The payload includes normal fields like customer name and delivery settings, but nothing that clearly maps to the invoice language setting.​

My question is:

• Is this customer language setting available anywhere in the QuickBooks Online API?

• If yes, what is the exact field name and how do you update it?

• If no, is there any supported workaround through Zapier or another official Intuit method?

My use case is simple: customers are created automatically, and I need invoices to be sent in the correct language without editing each customer manually.