Both of those are Apple's own infrastructure (aaplimg.com is Apple's CDN/edge domain), so it isn't a third party phoning home. The "apay-cash" part suggests the Apple Cash / Wallet side doing a periodic device check-in, which can happen as long as Wallet/Apple Pay is set up on the device, even if you don't actively use Apple Cash.
If you want to know which feature triggers it, NextDNS makes that easy: block just that domain for a day and see what breaks (card refresh in Wallet, Apple Cash balance, transit cards). If nothing you use breaks, you can leave it blocked; if Wallet starts complaining, you know what it was for.
Hope you feel better soon.