Google introduced an in-app payment framework to third-party Android developers earlier this year, but it relies on the Android Market to get the job done. That's not a problem for most Android-powered devices — but the upcoming Kindle Fire will lack access to the Market, which means in-app payments are off the table as well. As it turns out, Amazon's aware of the problem and it's working on a solution of its own that will work "using Amazon's merchandising and payments technology" — technology which has obviously been well honed over the years in the company's enormous retailing business. The service is currently in beta and interested developers can apply to start working with the SDK; of course, that does mean that they'll need to support two payment frameworks if they want to target both the Fire and mainstream Android tablets, but the Fire may just be a big enough seller to justify the trouble.