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Our client is using this plugin in combination with the woocommerce subscriptions plugin. A bunch of subscriptions were renewed at the start of the new year. The client reports that some customers got an invoice with the same invoice number and that a customer received the invoice for another customer. This mixing of customer info is a major problem.
I checked and could find 3 subscriptions that were renewed at the exact same time so I’m thinking that is the cause for the fact that the same invoice number was used on all three invoices.
The following issue is for another plugin, but I think something similar is happening here:
https://wordpress.org/support/topic/duplicate-invoice-numbers-3/