How can I see what apps I've purchased on iPhone

I tried to buy an app on my iPhone. It says I am accessing the App Store on a "new device." This phone is pretty old (iphone 4) and I've downloaded tons of apps on it so this is making me a little nervous. But maybe I've never paid for any apps on my iPhone--I can't remember for sure, but I thought I had. If I haven't paid for any apps before, would this make it show up as a "new device" in the app store?

Is there someplace I can go to see the history of what apps I've paid for in the iPhone App Store? (I tried going to my Mac Apps account, but it only lists apps I've purchased for my laptop.)

The reason I'm being so cautious is that at one point I accidentally created a second Apple ID and it was complicated getting that sorted out. I don't want to go through that again. So when I'm prompted to do things that don't seem logical, I'm very hesitant to go along with it. Thanks for any help.