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I'm reading : https://developers.whmcs.com/api-reference/getinvoices/ and I want to access a list of invoices and their items for each of these invoices, how can I proceed? I know I can use the action "GetInvoice" for each invoices obtained with the action "GetInvoices", but when you have 400 Invoices in requires 400 http request to get the items for each of those invoices. How can I combine my queries? Can't find it in the doc if it's in there.