Struct lightning::offers::refund::Refund

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pub struct Refund { /* private fields */ }

Expand description

A Refund is a request to send an Invoice without a preceding Offer.

Typically, after an invoice is paid, the recipient may publish a refund allowing the sender to recoup their funds. A refund may be used more generally as an “offer for money”, such as with a bitcoin ATM.

Implementations§

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impl Refund

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pub fn description(&self) -> PrintableString<'_>

A complete description of the purpose of the refund. Intended to be displayed to the user but with the caveat that it has not been verified in any way.

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pub fn absolute_expiry(&self) -> Option<Duration>

Duration since the Unix epoch when an invoice should no longer be sent.

If None, the refund does not expire.

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pub fn is_expired(&self) -> bool

Available on crate feature std only.

Whether the refund has expired.

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pub fn issuer(&self) -> Option<PrintableString<'_>>

The issuer of the refund, possibly beginning with user@domain or domain. Intended to be displayed to the user but with the caveat that it has not been verified in any way.

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pub fn paths(&self) -> &[BlindedPath]

Paths to the sender originating from publicly reachable nodes. Blinded paths provide sender privacy by obfuscating its node id.

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pub fn metadata(&self) -> &[u8] ⓘ

An unpredictable series of bytes, typically containing information about the derivation of payer_id.

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pub fn chain(&self) -> ChainHash

A chain that the refund is valid for.

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pub fn amount_msats(&self) -> u64

The amount to refund in msats (i.e., the minimum lightning-payable unit for chain).

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pub fn features(&self) -> &InvoiceRequestFeatures

Features pertaining to requesting an invoice.

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pub fn quantity(&self) -> Option<u64>

The quantity of an item that refund is for.

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pub fn payer_id(&self) -> PublicKey

A public node id to send to in the case where there are no paths. Otherwise, a possibly transient pubkey.

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pub fn payer_note(&self) -> Option<PrintableString<'_>>

Payer provided note to include in the invoice.

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pub fn respond_with( &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash, signing_pubkey: PublicKey ) -> Result<InvoiceBuilder<'_, ExplicitSigningPubkey>, SemanticError>

Available on crate feature std only.

Creates an InvoiceBuilder for the refund with the given required fields and using the Duration since std::time::SystemTime::UNIX_EPOCH as the creation time.

See Refund::respond_with_no_std for further details where the aforementioned creation time is used for the created_at parameter.

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pub fn respond_with_no_std( &self, payment_paths: Vec<(BlindedPath, BlindedPayInfo)>, payment_hash: PaymentHash, signing_pubkey: PublicKey, created_at: Duration ) -> Result<InvoiceBuilder<'_, ExplicitSigningPubkey>, SemanticError>

Creates an InvoiceBuilder for the refund with the given required fields.

Unless InvoiceBuilder::relative_expiry is set, the invoice will expire two hours after created_at, which is used to set Invoice::created_at. Useful for no-std builds where std::time::SystemTime is not available.

The caller is expected to remember the preimage of payment_hash in order to claim a payment for the invoice.

The signing_pubkey is required to sign the invoice since refunds are not in response to an offer, which does have a signing_pubkey.

The payment_paths parameter is useful for maintaining the payment recipient’s privacy. It must contain one or more elements ordered from most-preferred to least-preferred, if there’s a preference. Note, however, that any privacy is lost if a public node id is used for signing_pubkey.

Errors if the request contains unknown required features.

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