In WriteUpp you can add you your personal custom fields to your invoices. Here is how:

Create your custom fields that will appear in the patient summary if you haven't already done so -> How do I create my own fields in the patient summary? 

Go to Settings->Invoice

In the "Invoice Format" section select which custom fields you would like to appear on your invoice. You can add up to 3:

Click "Save"

Your custom fields will appear on your invoice like this:

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