How do I get Reference Number to pay for AVG through my bank?

I wanted to pay for AVG Software through my bank account I could not pay because at a point, I was asked to insert my reference number. Hence I am asking where can I get a Reference Number?

Hi Charles,

We are here to help.

We have a dedicated team to handle queries related to billing and purchases. We request you to contact them using the below link:

https://support.avg.com/support_sales_chat?l=en

Thank you.