Retrieves a single invoice by unique ID.
[WebMethod(Description = "Retrieves a single invoice by ID")] public TAuthInvoice GetInvoice(string token, int invoiceId);
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Parameters  | 
Description  | 
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string token  | 
String containing a token.  | 
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int invoiceId  | 
Integer unique ID of invoice to retrieve.  | 
TAuthInvoice containing the single invoice with the specified ID.
This function returns a single invoice with the specified internal ID.
The invoiceId parameter must be the ID of an existing invoice to retrieve.
The invoice is represented by a TInvoice object. It has an InvoiceItems property that contains a list of TInvoiceItem - each of these objects represents a line item on the invoice.
A token is passed for authentication. If the authentication fails, or other errors occur, no invoice is returned. The result of the authentication is represented by a TAuthenticate object.
Requires a valid registration key entry for the Finance feature.
This function has security level "Protected", and can only be accessed by users that have explicitly been granted permission to the API.
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