Better product keys with Flexkey. June 12, 2014 If you've ever built an e-commerce or SAAS application, there's a good chance you've provided your customers or users with randomly-generated product keys, invoice numbers, redemption codes, order numbers, etc. Flexkey is a Ruby gem to assist in this process. Consider a standard "Microsoft-style" product key: QPFLS-3OM4I-QQWXS-3QWX0-YQGSP.
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