At this time, it’s not possible to transfer purchased Google Play apps from one account to another.
Some developers are willing to issue refunds for purchases on old accounts if you repurchase the app(s) using a new account. You can always reach out to the developer of an app, and you can find their contact information by following these steps:
1.Visit Google Play and select the app in question
2. On the app’s description page, scroll down to the Developer section
3. Find either an email address, phone number or website listed.
Please see here for more information from Google.