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Spark Invoices are native payment requests for the Spark network. Unlike Lightning invoices, Spark invoices support both Bitcoin (sats) and tokens, with optional amounts, expiry times, and signature verification.

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Overview

Spark Invoices provide:
  • Sats & Token Support - Request payment in Bitcoin or any Spark token
  • Optional Amounts - Create invoices with or without a preset amount
  • Expiration - Set custom expiry times for invoices
  • Signature Verification - Cryptographically signed by the receiver
  • Batch Payments - Fulfill multiple invoices in a single call
Spark invoices are receiver-generated and receiver-signed. The receiver must create the invoice for signature validation.

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Create a Sats Invoice

Request a Bitcoin payment using a Spark invoice. createSatsInvoice(params) Creates a Spark invoice for receiving Bitcoin. 
const invoice = await wallet.createSatsInvoice({
  amount: 10000,              // Optional: amount in sats
  memo: "Payment for coffee", // Optional: description
  expiryTime: new Date(Date.now() + 3600000) // Optional: 1 hour expiry
});

console.log("Spark Invoice:", invoice.invoice);

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Create a Token Invoice

Request a token payment using a Spark invoice. createTokensInvoice(params) Creates a Spark invoice for receiving tokens. 
const invoice = await wallet.createTokensInvoice({
  tokenIdentifier: "btkn1...",  // Token identifier
  amount: 1000n,                // Optional: token amount
  memo: "Token payment",        // Optional: description
  expiryTime: new Date(Date.now() + 3600000)
});

console.log("Token Invoice:", invoice.invoice);

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Fulfill Spark Invoices

Pay one or more Spark invoices. fulfillSparkInvoice(params) Fulfills Spark invoices. Supports batch payments with a mix of sats and token invoices. 
// Pay a single invoice
const result = await wallet.fulfillSparkInvoice({
  invoices: ["spark1..."] // Invoice string
});

// Pay multiple invoices (batch)
const batchResult = await wallet.fulfillSparkInvoice({
  invoices: [
    "spark1...", // Sats invoice
    "spark1...", // Token invoice
  ]
});

// Pay invoice with no preset amount
const customAmount = await wallet.fulfillSparkInvoice({
  invoices: [
    { invoice: "spark1...", amount: 5000 } // Specify amount for zero-amount invoice
  ]
});
fulfillSparkInvoice can process multiple invoices in a single call, including a mix of sats and token invoices for different assets.

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Query Spark Invoices

Check the status of Spark invoices. querySparkInvoices(invoices) Query the status of one or more Spark invoices. 
const invoiceStatus = await wallet.querySparkInvoices([
  "spark1...",
  "spark1..."
]);

for (const status of invoiceStatus) {
  console.log("Invoice status:", status);
}

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Invoice Format

Spark invoices are Bech32m-encoded strings that contain:
  • Network identifier - Derived from the HRP (human-readable prefix)
  • Receiver’s identity public key - Who will receive the payment
  • Payment type - Sats or tokens (with token identifier)
  • Amount - Optional preset amount
  • Memo - Optional description
  • Expiry - Optional expiration time
  • Signature - BIP340 Schnorr signature from the receiver

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Use Cases

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Point of Sale

// Merchant creates invoice for specific amount
const invoice = await merchantWallet.createSatsInvoice({
  amount: 25000,
  memo: "Order #1234"
});

// Display QR code to customer
displayQR(invoice.invoice);

// Customer pays
await customerWallet.fulfillSparkInvoice({
  invoices: [invoice.invoice]
});

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Donations (Variable Amount)

// Create invoice without preset amount
const donationInvoice = await wallet.createSatsInvoice({
  memo: "Donation to Project X"
});

// Donor chooses amount when paying
await donorWallet.fulfillSparkInvoice({
  invoices: [{ invoice: donationInvoice.invoice, amount: 100000 }]
});

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Batch Payouts

// Pay multiple recipients in one call
await wallet.fulfillSparkInvoice({
  invoices: [
    employeeInvoice1,
    employeeInvoice2,
    employeeInvoice3
  ]
});

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Best Practices

  • Set expiry times - Use reasonable expiry times to prevent stale invoices
  • Validate before paying - Query invoice status before fulfilling
  • Handle zero-amount invoices - Always specify amount when paying invoices without preset amounts
  • Use memos - Include descriptive memos for record-keeping
  • Batch when possible - Use batch payments for multiple invoices to reduce overhead