today I am experiencing issues in creating invoices via the API.

Everything always worked just fine in past years so it is not a coding issue.

Also, other calls to query customers and existing invoices are still working just fine.

That said, this is how the XML I am sending to the API looks like (/invoices/create):

2. <Invoice>
3. <CustomerID>xxxxxxxxx</CustomerID>
4. <PaymentsDue>15</PaymentsDue>
5. <PaymentGateways>
6. <PayPal>2</PayPal>
7. <Braintree>true</Braintree>
8. <Authorize.Net>false</Authorize.Net>
9. <GoogleCheckout>false</GoogleCheckout>
10. </PaymentGateways>
11. <InvoiceItems>
12. <InvoiceItem>
13. <ItemName>Base Fee</ItemName>
14. <ItemDescription>test fee 1</ItemDescription>
15. <Price>5.99</Price>
16. <Quantity>1</Quantity>
17. </InvoiceItem>
18. <InvoiceItem>
19. <ItemName>Base Fee 2</ItemName>
20. <ItemDescription>test fee 2</ItemDescription>
21. <Price>0.60</Price>
22. <Quantity>12</Quantity>
23. </InvoiceItem>
24. </InvoiceItems>
25. <Comments>
26. <Comment>
27. <Description></Description>
28. </Comment>
29. </Comments>
30. <Terms>Payments are due upon receipt.</Terms>
31. </Invoice>

Again, this used to always work pretty fine. But today I getting only this as response:

1. <Response status="0"><Code>1000</Code><Message><![CDATA[Internal Error]]></Message></Response>

It looks like an internal problem of Zoho? I was unable to find any detail about that response code.

It's January 1st, so we urge to send out our invoices but currently cannot. Need a reply ASAP.

Thanks