I have purchased iman Pro before but App Store is charging me again

All purchase transactions and records are linked to your Apple ID. Please verify that you’re logged in with the same Apple ID used to purchase iman Pro.

Alternatively, you can review your purchase history. If iman Pro appears in your purchase history but you’re still experiencing charges, please reach out to Apple App Store support for further assistance.

For instructions on how to check your purchase history, please refer to this guide: here