Integration of custom Shopify form with Klaviyo

In this project, I implemented a complete cycle of setting up the email marketing infrastructure for a Shopify store through Klaviyo. The task was to set up a custom subscription form, create a subscriber list, automate the sending of a promo code, and provide the programmer with technical details for proper integration.
Completed works:
Subscriber list.
I created a separate list "Subscribers from the custom Style-Code form" in Klaviyo. I set up the Dabl Opt-in option for easier subscription and higher conversion.
Dynamic promo code.
I set up the integration of the -15% promo code between Shopify and Klaviyo. I created a coupon in Klaviyo linked to the discount in Shopify ("Style-Code Discount -15%") with the prefix Style-Code.
Automation (Flow)
I launched an automatic Welcome Flow called "Style-Code series with promo code (custom form)".
Trigger: adding a subscriber to the created list.
First email: instant sending of the promo code and CTA with a link to the website.
The Flow and email have been switched to Live mode.
Transfer of technical details.
I prepared and provided the programmer with all the necessary data for integrating the custom form (List ID, API keys, etc.).
Result:
The client received a ready-made system for collecting subscribers through a custom form on Shopify, integrated with Klaviyo. New users are automatically added to the database and receive a personalized email with a promo code. The programmer had all the technical details for a quick connection of the form.