Invoices

Utility methods for parsing Lightning Network BOLT 11 payment requests, as well as encoding unsigned requests and signing payment requests.

Methods

byteDecodeRequest

Derive a payment request from request data.

{
  encoded: <Payment Request Details Hex String>
  [mtokens]: <Millitokens Number String>
  network: <Network Name String>
  words: <Words Count Number>
}

@throws
<Error>

@returns
{
  request: <BOLT 11 Encoded Payment Request String>
}

Example:

const {byteDecodeRequest} = require('invoices');

// Get a BOLT 11 payment request for this invoice data
const {request} = byteDecodeRequest({
  encoded: paymentRequestDetailsHexString,
  mtokens: '0',
  network: 'bitcoin',
});

byteEncodeRequest

Derive bytes for payment request details

{
  request: <BOLT 11 Encoded Payment Request String>
}

@throws
<Error>

@returns
{
  encoded: <Payment Request Details Hex String>
  mtokens: <Millitokens Number String>
  network: <Network Name String>
  words: <Word Length Number>
}

Example:

const {byteEncodeRequest} = require('invoices');

// Get the bytes for a payment request
const {encoded, mtokens, network} = byteEncodeRequest({
  request: bolt11EncodedPaymentRequestString,
});

createSignedRequest

Assemble a signed payment request

{
  destination: <Destination Public Key Hex String>
  hrp: <Request Human Readable Part String>
  signature: <Request Hash Signature Hex String>
  tags: [<Request Tag Word Number>]
}

@throws
<Error>

@returns
{
  request: <BOLT 11 Encoded Payment Request String>
}

Example:

const {createSignedRequest} = require('invoices');

// Get hrp and signature from createUnsignedRequest
// Get signature via standard private key signing, or LND signBytes
const {request} = createSignedRequest({
  destination: nodePublicKey,
  hrp: amountAndNetworkHrp,
  signature: signedPreimageHash,
  tags: paymentRequestTags,
});

createUnsignedRequest

Create an unsigned payment request

{
  [chain_addresses]: [<Chain Address String>]
  [cltv_delta]: <CLTV Delta Number>
  [created_at]: <Invoice Creation Date ISO 8601 String>
  [description]: <Description String>
  [description_hash]: <Description Hash Hex String>
  destination: <Public Key String>
  [expires_at]: <ISO 8601 Date String>
  features: [{
    bit: <BOLT 09 Feature Bit Number>
  }]
  id: <Preimage SHA256 Hash Hex String>
  [mtokens]: <Requested Milli-Tokens Value String> (can exceed Number limit)
  network: <Network Name String>
  [payment]: <Payment Identifier Hex String>
  [routes]: [[{
    [base_fee_mtokens]: <Base Fee Millitokens String>
    [channel]: <Standard Format Channel Id String>
    [cltv_delta]: <Final CLTV Expiration Blocks Delta Number>
    [fee_rate]: <Fee Rate Millitokens Per Million Number>
    public_key: <Forward Edge Public Key Hex String>
  }]]
  [tokens]: <Requested Chain Tokens Number> (note: can differ from mtokens)
}

@returns
{
  hash: <Payment Request Signature Hash Hex String>
  hrp: <Human Readable Part of Payment Request String>
  preimage: <Signature Hash Preimage Hex String>
  tags: [<Data Tag Number>]
}

Example:

const {createUnsignedRequest} = require('invoices');

const unsignedComponents = createUnsignedRequest({
  destination: nodePublicKey,
  id: rHashHexString,
  network: 'bitcoin',
});
// Use createSignedRequest and a signature to create a complete request

parsePaymentRequest

Parse a BOLT 11 payment request into its component data

Note: either description or description_hash will be returned

{
  request: <BOLT 11 Payment Request String>
}

@throws
<Error>

@returns
{
  [chain_addresses]: [<Chain Address String>]
  cltv_delta: <CLTV Delta Number>
  created_at: <Invoice Creation Date ISO 8601 String>
  [description]: <Description String>
  [description_hash]: <Description Hash Hex String>
  destination: <Public Key String>
  expires_at: <ISO 8601 Date String>
  features: [{
    bit: <BOLT 09 Feature Bit Number>
    is_required: <Feature Support is Required To Pay Bool>
    type: <Feature Type String>
  }]
  id: <Payment Request Hash String>
  is_expired: <Invoice is Expired Bool>
  [mtokens]: <Requested Milli-Tokens Value String> (can exceed Number limit)
  network: <Network Name String>
  [payment]: <Payment Identifier Hex Encoded String>
  [routes]: [[{
    [base_fee_mtokens]: <Base Fee Millitokens String>
    [channel]: <Standard Format Channel Id String>
    [cltv_delta]: <Final CLTV Expiration Blocks Delta Number>
    [fee_rate]: <Fee Rate Millitokens Per Million Number>
    public_key: <Forward Edge Public Key Hex String>
  }]]
  [safe_tokens]: <Requested Chain Tokens Rounded Up Number>
  [tokens]: <Requested Chain Tokens Number> (note: can differ from mtokens)
}

const {parsePaymentRequest} = require('invoices');

// Decoded details of the payment request
const requestDetails = parsePaymentRequest({request: 'paymentRequestString'});