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Added x-cashu method to NUT-18 #204

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Added x-cashu method to NUT-18 #204

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9 changes: 9 additions & 0 deletions 18.md
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Expand Up @@ -78,6 +78,15 @@ The `n` tag specifies the NIPs the receiver supports. At least one tag value MUS

The execute the payment, the sender makes a `POST` request to the specified endpoint URL with the `PaymentRequestPayload` as the body.

#### X-Cashu

- type: `x-cashu`
- target: `<endpoint-url>`
- tags: `[["c", "replay"]]`

The payment is expected in the X-Cashu header on a request to the specified endpoint.
The tags specify constraints that the request MUST have. `replay` can be found in Payment Requests on HTTP 402 responses and requires that the exact same request is send again, but with a X-Cashu header paying the PR.
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The tags specify constraints that the request MUST have. `replay` can be found in Payment Requests on HTTP 402 responses and requires that the exact same request is send again, but with a X-Cashu header paying the PR.
Tags specify constraints that the request **MUST** satisfy. The presence of a `c` tag with `replay` value informs the payer that "replay" could be returned on HTTP 402 responses, prompting the payer to re-attempt the exact same request but with an X-Cashu header paying the Payment Request.


## Payment payload

If not specified otherwise, the payload sent to the receiver is a `PaymentRequestPayload` JSON serialized object as follows:
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