Hey Jason,

You can use PayPlans "Custom Content On Invoice" setting to show additional details on invoice page.
Go to Backend PayPlans >> Settings >> Invoice, general, here in Invoice Layout setting you can find "Custom Content on Invoice".

You can find it in "View available variable".Click on this and use the token from this to show on the invoice page.
[[INVOICE_SERIAL]] token for invoice serial.

Or if you want to change the invoice design then you can do it with joomla article. for this go to Backend PayPlans >> Settings >> Invoice, general, here in Invoice Layout setting you can find "Content Source" and select the joomla article.
You can try download my attached file and see one of the sample HTML format for this custom invoice content.

Let me know if you will have any queries.

Exactly what I needed, clearly explained. Thank you

Hi Jason,

You are most welcome.

Just for your information, I have locked and marked this thread as resolved to avoid confusion in the future. Please start a new thread if you have any other issues in the future so it will be easier for us to manage your inquiries.

Thanks for understanding.