i have use myibidder for android,and get win auction with this app . i want get pro version, but have no google wallet. can i using paypal to get this key? how?

and, is the key work with username or no in different app Stand-alone (Mac/Win), Mobile (Android, iOS, BB, webOS) App . thank you

I don't know how you can use PayPal on Google Play and not sure if it's even possible.
The other possibility is to check Amazon Appstore to see if they can accept it. Myibidder Pro is listed there as well.

I'm not sure I understood your second question. Please clarify.

ok. i see it in amazon. thank.

i mean, license work by ebay user name, not by kind of applications.

The license key is available for Windows application only.
You can't use it for mobile apps.