I've been using the Rewards feature to sell physical copies of some of my small roleplaying games. My impression is that the space to fill in an address doesn't appear until buyers go to the game download page after purchase - most of them go there swiftly and enter an address, but occasionally they don't, meaning they purchase the game but then give me no way to mail it to them. Is there any way to require that buyers input a mailing address during, rather than after, the purchasing process so that I get mailing information from everyone buying a physical reward?

I've added a notice to all of my physical rewards descriptions reminding people to please provide an address, but that doesn't always work. Sometimes I'm able to successfully contact buyers via email and request a mailing address that way, but I don't always get a response when I do that, either. One person who I was able to reach via email said that they had paid with PayPal and had assumed that the PayPal address information was given to me during that process until I reached out to them (as far as I can tell, it was not).