PaymentsBOT-ONLY

Bots can accept payments by sending invoices and handling checkout updates.

Sending an Invoice

sendInvoice sends an invoice. This example charges 100 Telegram Stars.

await client.sendInvoice(
  chatId,
  "Premium access",
  "Unlocks premium features.",
  "premium-access",
  "XTR",
  [{ label: "Premium access", amount: 100 }],
);

The payload identifies the purchase and is included in subsequent payment updates.

Confirming Checkout

Validate each preCheckoutQuery before allowing the payment to proceed.

client.on("preCheckoutQuery", async (ctx) => {
  const { invoicePayload } = ctx.update.preCheckoutQuery;

  if (invoicePayload === "premium-access") {
    await ctx.answerPreCheckoutQuery(true);
  } else {
    await ctx.answerPreCheckoutQuery(false, {
      error: "This item is no longer available.",
    });
  }
});

Handling Successful Payments

Fulfill the purchase after receiving a successfulPayment message.

client.on("message:successfulPayment", (ctx) => {
  const payment = ctx.msg.successfulPayment;
  console.log("Payment received for", payment.invoicePayload);
});