Hi @zhironghao,
Currently, via the REST API you can only view the Invoices by Account Number, therefore all Invoice for that Account will be displayed.
If you want to see the Invoice Items, then this is possible via SOAP API, by querying the Invoice Item Object, along with making use of the Invoice Object.
Alternatively, you could use the Data Source Export to get the Invoice Items by the Invoice Number.
I hope that this answers your question.
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