📍 Bolt Help / Core Products / Checkout / Custom Cart Checkout / Bolt Checkout Direct API Integration Guide / How to Set Up Shipping & Tax Endpoints

How to Set Up Shipping & Tax Endpoints

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Learn how to build and send shipping and tax payloads to Bolt Checkout.

Use the Merchant Callback API to handle shipping and tax information for your orders. This is required for multi-step checkout.

How to Use the Shipping & Tax APIs

TIP

Reach out to your CSM to have split shipping and tax enabled for your merchant account.

Shipping API

  1. Implement the Shipping API endpoint on your server.
  2. Respond to Bolt’s order.shipping POST request from your Merchant Callback API.
  3. Verify the authenticity of the request by confirming that it originated from Bolt.

PHP Example

<?php
require(dirname(__FILE__) . '/init_example.php');

$hmacHeader = @$_SERVER['HTTP_X_BOLT_HMAC_SHA256'];

$signatureVerifier = new \BoltPay\SignatureVerifier(
    \BoltPay\Bolt::$signingSecret
);

$requestJson = file_get_contents('php://input');

if (!$signatureVerifier->verifySignature($requestJson, $hmacHeader)) {
    throw new Exception("Failed HMAC Authentication");
}

$exampleData = new \BoltPay\Example\Data();
$response = $exampleData->generateShippingOptions();

header('Content-Type: application/json');
http_response_code(200);
echo json_encode($response);

Tax API

The Tax API endpoint is called after a shopper has chosen a shipping option.

  1. Implement the Tax API endpoint on your server.
  2. Respond to Bolt’s order.tax POST request from your Merchant Callback API.
  3. Verify the authenticity of the request by confirming that it originated from Bolt.

PHP Example

<?php

require(dirname(__FILE__) . '/init_example.php');

$hmacHeader = @$_SERVER['HTTP_X_BOLT_HMAC_SHA256'];

$signatureVerifier = new \BoltPay\SignatureVerifier(
    \BoltPay\Bolt::$signingSecret
);

$requestJson = file_get_contents('php://input');

if (!$signatureVerifier->verifySignature($requestJson, $hmacHeader)) {
    throw new Exception("Failed HMAC Authentication");
}

$requestJson = file_get_contents('php://input');

$shippingOption = json_decode($requestJson)->shipping_option;
$exampleData = new \BoltPay\Example\Data();
$response = $exampleData->generateTaxOptions($shippingOption);

header('Content-Type: application/json');
http_response_code(200);
echo json_encode($response);

Shipping & Tax API

WARNING

The combined Shipping & Tax endpoint will eventually be deprecated. Bolt recommends using the new, decoupled endpoints for Shipping and Tax.

  1. Implement the shipping_and_tax Merchant Callback API on your server.
  2. Respond to Bolt’s order.shipping_and_tax POST request from your Merchant Callback API.
  3. Verify the authenticity of the request by confirming that it originated from Bolt.

PHP Example

<?php
require(dirname(__FILE__) . '/init_example.php');

$hmacHeader = @$_SERVER['HTTP_X_BOLT_HMAC_SHA256'];

$signatureVerifier = new \BoltPay\SignatureVerifier(
    \BoltPay\Bolt::$signingSecret
);

$requestJson = file_get_contents('php://input');

if (!$signatureVerifier->verifySignature($requestJson, $hmacHeader)) {
    throw new Exception("Failed HMAC Authentication");
}

$exampleData = new \BoltPay\Example\Data();
$response = $exampleData->generateShippingTaxOptions();

header('Content-Type: application/json');
http_response_code(200);
echo json_encode($response);

Test the Endpoint

Use the following steps to test your Shipping and Tax API implementation:

  1. Navigate to your store.
  2. Open Bolt Checkout, enter an address, then continue to Shipping.
    • Bolt should hit your /shipping_and_tax endpoint.
    • The shipping and tax options from your response should appear in the Bolt Checkout modal.
  3. Try all shipping options.
  4. Ensure that the price of shipping and tax on the cart updates accurately.

Errors & Troubleshooting

To respond with specific errors in merchant api responses visit error codes documentation.

# shipping # tax # api
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