Custom text on PDF invoice based on payment method?

Hey there

What’s the best way to add some custom text to the PDF invoice based on the payment method.

Would it be best to do this through copying the template to a child theme, or could a function snippet filter hook work OK? Just wondering the best method to interact with your plugin.

I want to simply show bank account number if a user selects the bank transfer payment option – but this is a conditional as there’s no point in showing it on the credit card PDF invoice!

Thank you