Struct breez_sdk_liquid::lightning::offers::offer::Offer

pub struct Offer { /* private fields */ }

Expand description

An Offer is a potentially long-lived proposal for payment of a good or service.

An offer is a precursor to an InvoiceRequest. A merchant publishes an offer from which a customer may request an Bolt12Invoice for a specific quantity and using an amount sufficient to cover that quantity (i.e., at least quantity * amount). See Offer::amount.

Offers may be denominated in currency other than bitcoin but are ultimately paid using the latter.

Through the use of BlindedPaths, offers provide recipient privacy.

Implementations§

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impl Offer

pub fn chains(&self) -> Vec<ChainHash>

The chains that may be used when paying a requested invoice (e.g., bitcoin mainnet). Payments must be denominated in units of the minimal lightning-payable unit (e.g., msats) for the selected chain.

pub fn metadata(&self) -> Option<&Vec<u8>>

Opaque bytes set by the originator. Useful for authentication and validating fields since it is reflected in invoice_request messages along with all the other fields from the offer.

pub fn amount(&self) -> Option<&Amount>

The minimum amount required for a successful payment of a single item.

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

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

pub fn offer_features(&self) -> &Features<OfferContext>

Features pertaining to the offer.

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

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

If None, the offer does not expire.

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

The issuer of the offer, 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.

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

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

pub fn supported_quantity(&self) -> Quantity

The quantity of items supported.

pub fn signing_pubkey(&self) -> PublicKey

The public key used by the recipient to sign invoices.

pub fn supports_chain(&self, chain: ChainHash) -> bool

Returns whether the given chain is supported by the offer.

pub fn is_expired(&self) -> bool

Whether the offer has expired.

pub fn is_valid_quantity(&self, quantity: u64) -> bool

Returns whether the given quantity is valid for the offer.

pub fn expects_quantity(&self) -> bool

Returns whether a quantity is expected in an InvoiceRequest for the offer.

pub fn request_invoice_deriving_payer_id<'a, 'b, ES, T>( &'a self, expanded_key: &ExpandedKey, entropy_source: ES, secp_ctx: &'b Secp256k1<T>, payment_id: PaymentId, ) -> Result<InvoiceRequestBuilder<'a, 'b, DerivedPayerId, T>, Bolt12SemanticError>
where ES: Deref, T: Signing, <ES as Deref>::Target: EntropySource,

Similar to Offer::request_invoice except it:

derives the InvoiceRequest::payer_id such that a different key can be used for each request,
sets InvoiceRequest::payer_metadata when InvoiceRequestBuilder::build is called such that it can be used by Bolt12Invoice::verify to determine if the invoice was requested using a base ExpandedKey from which the payer id was derived, and
includes the PaymentId encrypted in InvoiceRequest::payer_metadata so that it can be used when sending the payment for the requested invoice.

Useful to protect the sender’s privacy.

This is not exported to bindings users as builder patterns don’t map outside of move semantics.

pub fn request_invoice_deriving_metadata<ES>( &self, payer_id: PublicKey, expanded_key: &ExpandedKey, entropy_source: ES, payment_id: PaymentId, ) -> Result<InvoiceRequestBuilder<'_, '_, ExplicitPayerId, SignOnly>, Bolt12SemanticError>
where ES: Deref, <ES as Deref>::Target: EntropySource,

Similar to Offer::request_invoice_deriving_payer_id except uses payer_id for the InvoiceRequest::payer_id instead of deriving a different key for each request.

Useful for recurring payments using the same payer_id with different invoices.

This is not exported to bindings users as builder patterns don’t map outside of move semantics.

pub fn request_invoice( &self, metadata: Vec<u8>, payer_id: PublicKey, ) -> Result<InvoiceRequestBuilder<'_, '_, ExplicitPayerId, SignOnly>, Bolt12SemanticError>

Creates an InvoiceRequestBuilder for the offer with the given metadata and payer_id, which will be reflected in the Bolt12Invoice response.

The metadata is useful for including information about the derivation of payer_id such that invoice response handling can be stateless. Also serves as payer-provided entropy while hashing in the signature calculation.

This should not leak any information such as by using a simple BIP-32 derivation path. Otherwise, payments may be correlated.

Errors if the offer contains unknown required features.

This is not exported to bindings users as builder patterns don’t map outside of move semantics.