Can I let users purchase any app I want using in-app-purchases?

TimoSchmidtTimoSchmidt DEMember ✭✭

Hello!

My app needs a computer voice to output text, and the user should have the ability to choose a voice of his / her choice.

I've seen other application do this via in-app-purchases.
The user is presented a list of available free / purchase voices, and the user can purchase it.

I know it sounds silly, but I don't know how this is done.
Do I have to ask the author of the computer voices for permission so that I can show them as an in-app-purchase?

And I would also very much like to ask if the voice itself would then be a non-consumable, and I would have to keep track that the user purchased it?

Thanks for the newbie help very much!

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