Good day, userjoshua.
I understand that you want to add a payment date to the invoices. The only way is to create a custom field and manually add the date. Please follow these steps:
- Go to the Gear icon and select Custom form styles.
- Find your custom invoice and click Edit. From the Content tab, click the Header section (top part) of the preview.
- Click the + Custom field link. Check one of the boxes and enter a name, like Payment Date.
- Tap Done to save it.
Once done, you can open the invoice and you'll see the custom field you created. It won't reflect in the invoice once you send or print it if there's no data added to the field.
For more details, please check this link:
I'll be here if you need anything else. Leave a comment below and I'll get back to you as soon as I can.