Why can’t I add the add-on products to cart

OverviewClick to copy

Summary: This article covers common issues users face when trying to add OneTick add-on products to their cart on Shopify stores. Four common scenarios include missing theme helper activation, out-of-stock add-on products, conflicts with third-party apps that modify the default “Add to Cart” button, and incompatibility with subscription products.

After reading, users will be able to troubleshoot the problem of not being able to add add-on products when using OneTick functionality on Shopify pages.

In this article:

Overview

How To Fix Issue Cannot Add Add-on Product To Cart?

Tips & Best Practices

How to Fix Issue Cannot Add Add-on Products To Cart?Click to copy

Why Issue Cannot Add Add-on Product To Cart Happens?Click to copy

1st Scenario: Users Haven’t Enabled The Theme Helper for OneTickClick to copy

The theme helper is crucial to make the checkbox work properly because OneTick’s JS codes only run when users turn on the theme helper.

2nd Scenario: The Add-on Product Is Sold OutClick to copy

If the add-on product is sold out, the checkbox is still shown but customers cannot add them to cart.

3rd Scenario: The Default Add To Cart Button Is OverridenClick to copy

The way OneTick works on your page is that the app would query the default atc button to trigger the atc event of the add-on product. In some cases, users use 3rd-party apps that override their default atc button, which results in the add-on product not being able to atc.

How To Fix Issue Cannot Add Add-on Product To Cart?Click to copy

1st Scenario: Users Haven’t Enabled The Theme Helper for OneTickClick to copy

  • Step 1: Access WIP OneTick App

In Shopify home menu, go to App > Search and select app “WIP OneTick”

Why can't I add the add-on products to cart

  • Step 2: Enable Theme Helper

In “Get started with OneTick” section, make sure that Enable theme helper is turned on

Why can't I add the add-on products to cart

2nd Scenario: The Add-on Product Is Sold OutClick to copy

Users need to add stock or select “Continue selling when out of stock”.

Add Stock:

  • Step 1: In the Shopify admin, go to Products > Inventory.

Why can't I add the add-on products to cart

  • Step 2: Select the product you want to add stock. You can adjust the On hand or Available quantity of a single variant or multiple variants by the same amount. To adjust a single variant, enter the quantity in the On hand or Available column of the variant that you want to adjust.

Why can't I add the add-on products to cart

  • To adjust multiple variants by the same amount, select the variants that you want to edit and click Update quantities

Why can't I add the add-on products to cart

  • Click Save

Why can't I add the add-on products to cart

Note: When you adjust the On hand quantity, your Available quantity is updated by the same amount.

Select “Continue Selling When Out Of Stock”

  • Step 1: In the Shopify admin, go to Products > Inventory

Why can't I add the add-on products to cart

  • Step 2: Select product that you want to continue selling when out of stock. Go to Inventory > Enable Continue selling when out of stock
  • Step 3: Click Save to apply changes

Why can't I add the add-on products to cart

3rd Scenario: The Default Add To Cart Button Is OverridenClick to copy

If you suspect that one of the third-party apps you’re using might override the default “Add to Cart” button, please contact the support team of that third-party app or contact OneTick Support Team for assistance.

Tips & Best PracticesClick to copy

  • Always ensure the theme helper for OneTick is enabled to allow Shopify’s JavaScript codes to function correctly.
  • Keep a close eye on your inventory and consider enabling the “Continue selling when out of stock” option to avoid missing out on sales.

If you encounter any issues not covered in this article, please reach out to OneTick Support Team for assistance.

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