First, let me say thank you if you have made an in-app purchase of the Teleprompter For Video app.
To obtain an invoice or a receipt for this purchase:
As the purchase is made with Apple App Store or Google Play Store, you will need to request this with Apple or Google.
There are instructions on how to do this on the support pages below:
Apple App Store receipts:
https://support.apple.com/en-gb/HT204088
Google Play Store receipts:
