API Helper

API Helper

by William Belk

Simplifies AJAX email sign ups and discount codes

4.1 of 5 stars(3 reviews)

About API Helper

NOTE: This Shopify app is a tool for frontend developers. It requires a basic understanding of the Javascript programming language.

API Helper simplifies AJAX email sign ups and discount code creation for Shopify. The app provides a secure frontend API that provides access to important functions from Klaviyo, Mailchimp, Omnisend and Shopify that are not accessible due to CORS policies inside of Shopify themes.

The app currently has modules for:

  • Klaviyo (subscribe, unsubscribe, backinstock, track)
  • Mailchimp (subscribe, unsubscribe)
  • Omnisend (subscribe, unsubscribe)
  • Shopify (subscribe, unsubscribe, unique discount code create)

API Helper provides a simple callback and standard response structure that makes life so much easier. API Helper also allows for plug-and-play or 'hot swap' customer sign-ups between Klaviyo, Mailchimp, Omnisend, and Shopify. If you are a Shopify development agency or a freelancer with many clients, this could save you hours of time.

There are no scripts required to use the app. After enabling your first app module inside of the app, our js file from the API Helper app is injected into your theme at the end of page load. This file is 1.4KB and served from Google's CDN. The file is removed immediately when the app's modules are disabled or the app is uninstalled.

Integrates with

  • Klaviyo,
  • Mailchimp,
  • Omnisend,
  • Discounts API

See the app in action

Explore how the app works in an example store.

View example store

Media gallery


Pricing 7-day free trial


Free to install. Modules starting at $6 / month.

* All charges are billed in USD.
** Recurring charges, including monthly or usage-based charges, are billed every 30 days.

4.1 of 5 stars

The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.

  • 5 of 5 stars
    67% of ratings are 5 stars
  • 4 of 5 stars
    0% of ratings are 4 stars
  • 3 of 5 stars
    0% of ratings are 3 stars
  • 2 of 5 stars
    0% of ratings are 2 stars
  • 1 of 5 stars
    33% of ratings are 1 stars

Most recent reviews

Little Sprog

Use this app to simplify a front end newsletter sign up and integrates opt-in amongst other things. This was exactly what I needed and makes it so easy!! Amazing app, cannot recommend enough. The only think I am concerned about is how up to date it is kept? If I use this and rely on it, will it be reliable in 3 years time for example? Thanks so much!


We used this app to help for Klaviyo subscription. The code is very easy to use and saves time. Support's answer are very fast and useful.


Cant use shopify discount function.
got error"This action requires merchant approval for write_price_rules scope"
Not great app

Developer reply

April 4, 2020

Sorry for your issue! There was a change to Shopify's API version that affected the discount code creation. The issue has been resolved on our end. Please uninstall the app and reinstall — the issue should be now be fixed. Please reach out if you have any further issues.