Use the ExtendDueDate function if you want to extend the due dates on the invoice. 

This function should be used sparsely. One example when this could be used is if the customer has not received the original invoice. 

Please note that this function is only available for the products Invoice and Direct Invoice

This method is available in the following countries:  
   
Input Parameters:

Field nillable Max Type Description
Username false 50 string The username used to authorize the request.
Password false 50 string The password used to authorize the request.
StoreId true 4 short The StoreId used for identification of store.
CorrelationId true 50 string CorrelationID is sent back in the response.
CountryCode false 2 string The country code (ISO 3166-1 alpha-2) for the country.
InvoiceNo false 50 string The InvoiceNo previously returned in AddInvoice.

 

Output Parameters:

Field nillable Max Type Description
CorrelationId true 50 string CorrelationID from the request if any.
DueDate true - datetime The new due date on the invoice.