sorry in advance my English …
But I was thinking about the next thing
it might be useful (at least for me it would) send automatic emails to customers (for recurring bills - which should not necessarily be based on an invoice but they should choose what to bill regardless of the bill “origin”) to be notified x days prior to its issuance, and also send all’aministratore of the system so as not to forget to re-contact the customer …
then I’m trying to integrate as whatsapp notification system in invoiceplane
I found it quite by accident … and I fell in love right away! you are great 