Can I cancel the order for an In-App purchase?

I do know that you can request a refund for an app that you got from the Apple App Store and the following is how you would go about that:

• Request a refund for apps or content that you bought from Apple - Apple Support

However, I'm not sure if Apple will reimburse you for purchases made within that app, and you may need to contact the app's developer for assistance.

Ref: How to contact an app developer - Apple Support

If you got an email receipt, use the 'Report a Problem' link in it. Otherwise, click here and ask the iTunes Store staff for a refund.

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