Nope, there is no way to check it. It's been a long time since I've done this, but before you could check the validity of the code before adding it to your account
So there was a possibility and now there is no ?
Does AMAZON help the scammers in their business ? Why are they doing everything they can not do to make it stop and ? What's the problem with giving tools for justice ?
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A little from another barrel.
Can I send money from my account (which I have from the code) to another user's address even if they have an account in another region? For example from Amazon UK to Amazon USA ?
No you can't.
Each com,de,ca,uk have different currency and etc.
You can't do currency exchange based on the USD/EUR/GBP in Amazon.