Hi @nobleogyify.
As already mentioned, today it is not possible to develop your app using only Corona SDK. You would have to go Corona Enterprise and use some SDK that provides image recognition. Since it appears to be a simple app, you may find better to simply go full native on developing it or use other frameworks that already support that SDK…
About image recognition SDK, I recommend you to check the Vuforia SDK. Vuforia is a SDK that gives you Augmented Reality and also image recognition. They have iOS, Java & Unity plugins. You can find several tutorials/videos about how to use Vuforia on Unity.
On a high high level approach, to develop that app using the Vuforia you will have to:
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Create an account on the Vuforia website and download the SDK.
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On the Vuforia SDK website, you will have to upload the images that you want to recognize (i.e, all your bills). The website will generate a database file based on that images. You will have to download that file and add to your project together with Vuforia SDK.
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On your project, you need to add Vuforia SDK and configure it to use the database file (that you download from the Vuforia site).
Vuforia has a free tier that is very generous, so you will probably be able to do everything that you need for free.