Can I change which Apple ID the Fuelly / Gas Cubby Pro app is tied to?

[dieselsmoke1967]

I originally purchased Gas Cubby Pro many years ago, under my original Apple ID.

Then, at one point, Apple forced users to either create new Apple IDs or make some change to existing IDs that I was unable to make, so I created a new Apple ID.

A month or so ago, I paid the $4.99 Upgrade to Premium fee. I didn't realize it at the time, but the upgrade fee was paid on my current Apple ID (not the one Gas Cubby was originally purchased under), and so even though I paid the upgrade fee, it isn't recognized by my app.

Is there a way to "transfer" my account to my new Apple ID so that I can get the use of the upgrade fee I paid?

Possibly backup/save/export my vehicle data, delete the app, download the app under my current Apple ID and then restore the data, and Premium subscription?

Thank you,
Tom