Duplicate invoice generated at the same time

[Julia Nunes]

We identified a case where Killbill generated two invoices for the same account and same target date.
Both invoices have status = COMMITTED and were created at the exact same timestamp, but with different created_by values. This suggests that two different processes might have triggered invoice generation simultaneously.

Example:

• Account: 00058ba4-b7ff-457c-9347-53335c1bae62

• Target Date / Invoice Date: 2025-08-30

• Invoices generated:

"id" : "33494534-876e-4a8d-a57e-c92e0e2f3a5e", "created_by" : "Next Billing Date", "created_date" : "2025-08-31T01:35:28.000Z"

"id" : "a12ce4e7-e440-41aa-bcf1-26ae671a413b", "created_by" : "SubscriptionBaseTransition", "created_date" : "2025-08-31T01:35:28.000Z"

Impact:

• Duplicate invoices created for the same account and date.

• Double charging the customer.

Question to the Killbill team:

• What is the recommended way to handle this case ?

• How can we prevent this duplication from happening again ?

[karan bansal]

Hi Julia,

Could you please query both the above invoices with this endpoint and share the results. It would also be helpful if you can list down the steps to reproduce this issue as well as sample catalog used. Please also share Kill Bill logs if possible.  

Regards

Karan