Handle a callback

import {
  CallbackVerificationError,
  InvoiceNotPaidError,
} from '@billions-works/sdk-ts';

try {
  const verifiedInvoice = await api.verifyInvoicePaid({
    id: request.body.id,
    status: request.body.status,
    paid_amount: request.body.paid_amount,
  });

  // Find the order by verifiedInvoice.order_no.
  // Transition it to paid exactly once.
  return response.status(200).send('OK');
} catch (error) {
  if (
    error instanceof InvoiceNotPaidError ||
    error instanceof CallbackVerificationError
  ) {
    // Reject or postpone processing. Do not mark the order as paid.
    return response.status(202).send('Payment is not verified');
  }

  throw error;
}

<?php

use Billions\Exception\CallbackVerificationException;
use Billions\Exception\InvoiceNotPaidException;

try {
    $verifiedInvoice = $api->verifyInvoicePaid([
        'id' => $_POST['id'],
        'status' => $_POST['status'],
        'paid_amount' => $_POST['paid_amount'],
    ]);

    // Find the order by $verifiedInvoice['order_no'].
    // Transition it to paid exactly once.
} catch (InvoiceNotPaidException | CallbackVerificationException $exception) {
    // Reject or postpone processing. Do not mark the order as paid.
}

curl --request GET \
  --url "https://api.billions.works/public/v1/invoices/$BILLIONS_INVOICE_ID" \
  --header "Content-Type: application/json" \
  --header "x-api-key: $BILLIONS_API_KEY"