AI-generated Key Takeaways
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          The content describes a request message used to fetch invoices for a specific customer and billing setup within a given month. 
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          The request requires the customer ID, the billing setup resource name, the issue year (yyyy format, 2019 or later), and the issue month. 
Request message for fetching the invoices of a given billing setup that were issued during a given month.
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 Required. The ID of the customer to fetch invoices for. | 
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 Required. The billing setup resource name of the requested invoices. 
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 Required. The issue year to retrieve invoices, in yyyy format. Only invoices issued in 2019 or later can be retrieved. | 
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 | Required. The issue month to retrieve invoices. |