No confirmation mail after succesful payment

Hi,

On PHP8, are the orders status being changed from created to confirmed ?
Do you see the missing emails in the Customers>Email history menu ?
Also, it's likely there is a fatal error somewhere. So look at the end of the PHP error of your server just after you reproduce the issue. You should see one, or several, "fatal error" message(s) with the line number and file path where the error happened.
It could come from the Ideal plugin, but it could also come from a custom plugin, some mass action (in System>Mass actions), or some customization of the emails (in System>Emails). So first checking all this is important before we can draw any conclusion.

Hi,

If you see the emails in Customers>Emails, then HikaShop did send the emails to the receiver and your hosting email server accepted them.
So you'll have to check with your hosting support as there most be a problem with your email settings, either in the Joomla configuration or in the HikaShop configuration.

Hi,

You apparently are using an old version of the PDF invoice plugin which isn't compatible with your version of PHP.
The download link given to you when you purchase the PDF invoice plugin gives you access to the latest version of the install package for 4 years.
So if your order is less than 4 years old, you can access it via the menu My account>My orders to get the download link, and then install the new version of the plugin on your website and you should not have the error anymore.