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by objclxt 3226 days ago
Payment Request is a JS / client-side API (it's all about getting payment information from the browser to the website), so HTTP codes don't really come into it.

However, there's a proposed server/HTTP specification that does include it. It lacks the same broad support that Payment Request has, so is still in quite an early stage of development - https://www.w3.org/TR/webpayments-http-api/