Registration Request: X-402-Challenge

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Field Name: X-402-Challenge
Status: provisional
Structured Type: Item
Specification Document(s): https://datatracker.ietf.org/doc/draft-shabazz-http-x402-tswp/ (Section 3.2.1)
Comments: Issued by servers in HTTP 402 (Payment Required) responses containing an ephemeral RFC 4122 UUIDv4 token for machine-to-machine payment negotiation.

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