[mrtksn]

In Apple's case, you as a customer, need a valid payment method from the country your account is going to be.

PS: Apple, probably Google too, have tiered pricing where you choose the price of your app or your content will cost and Apple takes care of the local pricing which is adjusted to your users purchasing power.

[HWR_14]

I do not think Google has a similar "tier" concept. It has a "recommended price", which is a conversion to the local currency maybe, but maybe not, taking into account PPP. But you can go in and override those prices if you want to make your product particularly cheap or more expensive in a random country.