Amazon says it's prepared to go to court against US consumer protection authorities to defend itself against charges it hasn't done enough to prevent children from making unauthorised purchases.
The Federal Trade Commission alleges in a draft lawsuit released by Amazon that unauthorised charges by children using apps on Amazon tablets have amounted to millions of dollars.
Amazon said in a letter to FTC Chairwoman Edith Ramirez that it has already refunded money to parents who complained.
Apple agreed to a $US32.5 million ($A35.16 million) fine in January over a similar matter.
The FTC wouldn't comment on whether it is investigating, but says it's focused on ensuring companies comply with the principle that consumers shouldn't have to pay for unauthorised purchases.
