CyberFausto

Hello everybody, I am trying to change the tax rate after or while an invoice is beeing created. I was wondering which approach is the best for this. which event is the best for this scenario. Also if the hook fires do i have to change the rate trough the internal API or directly in the SQL? Also after i change the rate will WHMCS send the email with the changes? Does the email reload the invoice before sending? thank you very much,