How do I add offline transaction data in Google Analytics?

There are a few things you can do. You can create a dummy URL on your website and pass data into query parameters, e.g.: mywebsite.com/conversionpage/?event_category=Purchase&event_action=payment_success&event_label=ordernumber&event_value=100 For this, you may want to export your offline transactions into a Google Sheet, create a new column that will grab data from exported transactions and generate that URL. On your website, you'll have to create a short javascript that will grab all that data from URL and send an event. This is useful if there is not a lot of offline events. If there is a lot of events, your developers can create a webhook that will fire a Google Analytics event every time offline transaction is registered. I can explain this in more detail, just hit me up on Linkedin.