2.1.2 Fresh receipts may be requested through the resource identified in the Location header.

[roywill]

Since this section is talking about registration, why is refresh paradigm left dangling at the end. Is it thought to use this same method to ask for a refresh? I can see getting a new receipt, but that may fail due to the time validity of the signed statement. If you expect it to be based on previous data on the log, then it needs to be indexed based on the previous receipt.

[JAG-UK]

Sounds sensible. Something like '/reissue?receiptid=xyzy

Where 'xyzy' is the durable ID of a receipts that is already included in the log (I'm being deliberately obtuse with the ID format since that's under question in a separate Issue).

Please submit a PR that matches your use case needs.