Validate Voucher (client-side) [Deprecated]



This endpoint represents the deprecated version of the API responsible for voucher validation, and we do not recommend using it. The new Stackable Discounts API introduces additional features and improvements while maintaining backward compatibility, including applying a combination of coupon codes and promotion tiers. Developers are encouraged to migrate to the latest version to take advantage of the latest enhancements and bug fixes. No updates will be provided to the deprecated endpoint.

To verify a voucher code given by customer, you can use this method. It is designed for client side integration which means that is accessible only through public keys. This method is designed to be run directly either in web browsers or mobile apps.


Specifying gift credits and loyalty points

This endpoint does not support specifying the specific amount of gift credits to apply to an order nor the specific amount of loyalty points to an order. It calculates the amount that is available on the card and applies as much credits or points as possible to cover the total amount.

Set customer identity (optional)

Voucherify can help you track anonymous customers. Once you integrate Voucherify into your web app and call the validate method, Voucherify will return a tracking ID and the script will store it in a cookie. Each subsequent validate call will use the same tracking ID.

Voucherify tracks a user using a tracking ID to see if the user who is validating vouchers is the same as the one who consuming them. Voucherify does this by setting up an identity for the user. A tracking_id will be generated on the server side, unless you specify your own tracking_id. In both cases, you will receive the tracking_id in the validation response.

The returned tracking_id field should be used as the customer source_id in subsequent redemption requests. Moreover, the tracking_id returned from Validation API is encoded. Voucherify will recognize both values for identifying customer - the one before encryption sent as a query parameter to the GET /validate request, and the version encrypted and returned as part of the validation request.

Sample workflow

Customer tracking workflow in a nutshell:


  • A customer visits your website.
  • A customer validates a voucher code. That triggers a validate request to be sent to Voucherify. In the request, you pass the tracking_id or customer.source_id. As a result, the API call to this endpoint returns an encoded tracking_id.


  • Once the customer finishes the checkout process, your website passes the tracking_id to your backend during a redemption call. The tracking_id is sent as a value assigned to the property source_id in a customer object.
  • A customer object is created and within the redemption response, you get a customer id.
  • You can use the customer id or the customer source_id to fetch or modify the customer details.

A customer is created (upserted) automatically with a redemption call. Alternatively, you can create a new profile by creating a customer via a dedicated API method. Take a look at the customer object to understand the entity's structure.


Customer identifier

The source id of the customer may either be an already hashed version of the tracking_id, which you received in a response from a validation request or a custom ID you predefined (i.e. an email address). Nevertheless, we recommend using identifiers delivered by Voucherify API.

curl -X GET \
  -H "X-Client-Application-Id: 011240bf-d5fc-4ef1-9e82-11eb68c43bf5" \
  -H "X-Client-Token: 9e2230c5-71fb-460a-91c6-fbee64707a20" \
  -H "Content-Type: application/json" \
  -H "origin:" \
curl -X GET \
  -H "X-Client-Application-Id: 011240bf-d5fc-4ef1-9e82-11eb68c43bf5" \
  -H "X-Client-Token: 9e2230c5-71fb-460a-91c6-fbee64707a20" \
  -H "Content-Type: application/json" \
  -H "origin:" \
curl -X GET \
  -H "X-Client-Application-Id: 011240bf-d5fc-4ef1-9e82-11eb68c43bf5" \
  -H "X-Client-Token: 9e2230c5-71fb-460a-91c6-fbee64707a20" \
  -H "Content-Type: application/json" \
  -H "origin:" \
curl -X GET \
  -H "X-Client-Application-Id: 011240bf-d5fc-4ef1-9e82-11eb68c43bf5" \
  -H "X-Client-Token: 9e2230c5-71fb-460a-91c6-fbee64707a20" \
  -H "Content-Type: application/json" \
  -H "origin:" \

<script type="text/javascript" src=""></script>

<script type="text/javascript">
  function init() {
      "011240bf-d5fc-4ef1-9e82-11eb68c43bf5", //YOUR-CLIENT-APPLICATION-ID-FROM-SETTINGS
      "9e2230c5-71fb-460a-91c6-fbee64707a20" //YOUR-CLIENT-TOKEN-FROM-SETTINGS
  //-- [Optional] If you want us to track your customers' activity, then you should invoke the following function to set identity. You have to do it only once. If the identity parameter is not passed, then we will generate it for you.
  Voucherify.validate("Testing7fjWdr", function callback (response) {

Examples with Query Parameters

Query ParametersExample URL
Shortcut - customer query param instead of customer[source_id]
Pass customer's and redemption's context metadata in query parameters[shop]=1&customer[metadata][propsy]=2&metadata[test]=true
Use tracking_id instead of source_id[shop]=1&metadata[test]=true

Reasons why a validation might fail

Voucher validation might fail because of one of these reasons:

  • voucher not found - voucher doesn't exist or was deleted
  • voucher expired - voucher is out of [start date - expiration date] timeframe
  • voucher is disabled - learn more about disabled vouchers
  • customer does not match segment rules - learn more customer tracking LINK
  • order does not match validation rules - learn more about validation rules LINK
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