Dynamic code generation

A coupon code is a unique code that can be used by a single user (either single or multiple use). The Punchh framework generates coupon codes, which can be processed within a mobile app or at the point-of-sale (POS) system.

Using the Punchh coupon framework and Braze, you can achieve the following scenarios:

• Generate a coupon code when the guest clicks a coupon generation link in an email: The coupon code will be generated dynamically and shown on a web page.
• Generate a coupon code when the guest opens an email: The coupon code will be generated dynamically and shown as an image within the email.

How to integrate Punchh dynamic coupon code generation

Step 1: Create a coupon campaign in Punchh

1. Using a Punchh coupon campaign, create a dynamic generation coupon campaign as shown in the following image.
2. The Punchh coupon framework will generate the following parameters to enable dynamic coupon generation:
   • Dynamic coupon generation token: This is a system-generated security token for encryption.
   • Dynamic coupon generation URL: This URL will be embedded in the email as a link or image, as required by the business.

Step 2: Generate signature and construct URL

The JWT.IO library decodes, verifies, and generates JSON web tokens, an open, industry-standard RFC 7519 method for representing claims securely between two parties.

The following ClaimType names can be used to ensure the uniqueness of guests and coupons:

• email: represents the user’s email address.
• campaign_id: represents the system-generated Punchh campaign ID.
• first_name: captures the user’s first name.
• last_name: captures the user’s last name.

To use the Punchh dynamic coupon code API, a JWT Token must be constructed. Add the following Liquid template to your Braze dashboard in the message body of the channel you’d like to use:

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{% capture header %}{"alg":"HS256","typ":"JWT"}{% endcapture %}

{% capture payload %}{"campaign_id":"CAMPAIGN_ID","email":"{{${email_address}}}","first_name":"{{${first_name}}}","last_name":"{{${last_name}}}"}{% endcapture %}

{% capture signature_structure %}{{header | base64_encode}}.{{payload | base64_encode | remove: '='}}{% endcapture %}

{% assign secret = "DYNAMIC_COUPON_GENERATION_TOKEN" %}

{% assign final_signature = {{signature_structure | hmac_sha256_base64: secret}} %}

{% capture jwt %}{{signature_structure}}.{{final_signature | remove: '='}}{% endcapture %}

Replace the following:

Step 3: Append coupon code to message body

Link to Punchh web page

To link to a Puncch-hosted web page, add the following snippet to your message body.

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https://SERVER_NAME.punchh.com/request_coupons/DYNAMIC_COUPON_GENERATION_TOKEN?sign={{jwt}}

Replace the following:

When a user clicks the coupon URL, they’ll be redirected to a Punchh-hosted web page, where their generated coupon will be displayed.

Extract code via JSON as plain text

To return a JSON response, add .json before the sign query parameter of the Punchh URL as shown in the following snippet:

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https://SERVER_NAME.punchh.com/request_coupons/DYNAMIC_COUPON_GENERATION_TOKEN.json?sign={{jwt}}

Replace the following:

You could then leverage Connected Content to insert the code as plain text into any message body. For example:

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{% connected_content https://SERVER_NAME.punchh.com/request_coupons/DYNAMIC_COUPON_GENERATION_TOKEN.json?sign={{jwt}} :save punchh_coupon %}
{{punchh_coupon.coupon}}

Link image inside email content

To link the coupon code inside an image, add the following snippet to your message body:

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<img src="https://SERVER_NAME.punchh.com/request_coupons/DYNAMIC_COUPON_GENERATION_TOKEN.png?sign={{jwt}}">`

Replace the following:

Your output will be similar to the following:

Associated error messages