Hard to say how their IAP setup will work, but this isn't far from how Paddle works for online checkouts today. They separately track your customers and your 'a

Hard to say how their IAP setup will work, but this isn't far from how Paddle works for online checkouts today. They separately track your customers and your 'audience' - the people who tick the 'send me marketing' box during checkout (https://paddle.com/support/what-is-paddle-audience/ https://paddle.com/support/what-is-paddle-audience/). Customer emails are available, but it's explicit that they haven't opted-in for marketing, so if you're subject to GDPR or anything similar (most Paddle vendors, since I think the EU is Paddle's core market) then you can't use the email for anything but necessary account setup & support. Meanwhile audience emails are explicitly fair game for upsells/offers/etc.