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[Bolt11] Clarify when payment secret should be included (#747)

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Payment secret must be included if and only if the corresponding feature bit is set.
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Jonathan Underwood 2020-02-27 17:32:09 +09:00 • committed by GitHub
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11-payment-encoding.md
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@ -153,7 +153,8 @@ Currently defined tagged fields are:
### Requirements
A writer:
- MUST include exactly one `p` and `s` fields.
- MUST include exactly one `p` field.
- If the `payment_secret` feature is set, MUST include exactly one `s` field.
- MUST set `payment_hash` to the SHA2 256-bit hash of the `payment_preimage`
that will be given in return for payment.
- MUST include either exactly one `d` or exactly one `h` field.