Include contact id on GET /invoices
When retrieving invoices using the GET /invoices method the contact portion does not contain the Xero contact ID or contact Code therefore an additional series of GET /invoice/invoiceID method calls are required to establish the contact.
11
votes

We will return the ContactID in our next API update – a developer preview release will be available during the week of 7-11 Sept 09.
The ContactID is the recommended identifier to store in your system for a Xero contact.
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Sam Johnston commented
This looks more like a bug than a feature request - and one that's probably a> useful and b> fairly easily fixed too.