Shop pay installments on a GraphQL order query

When you query a shop pay installment order, what is the identifier that this is a shop pay installment order? Does the gateway change or is it something else? Does anyone have an example? We use a custom middleware to pull orders into our ERP and I want to make sure these map over correctly and we have a way to identify these for reporting/accounting purposes. The gateway for a normal shop pay order is “gateway”: “shopify_payments”