is there anyway to download a app and not pay for in app purchases immediately just because you downloaded the app??

That depends on what the in-app purchases are for. If they are subscriptions, then no; the first time you use the app you will have to pay for a subscription. If it is for other services you don’t have to pay for them until you need them.

No app charges you for in app purchases when you download it.

Some apps require a subscription.

They are not the same thing.