Skip to main content
This guide explains how to add Sezzle as a payment option on your Shopify website, enabling customers to use Sezzle at checkout.

​
Install the Sezzle Payments App

  1. Log in to your website’s Shopify admin
  2. Install the Sezzle Payments app
    1. Go to Settings > Payments
    2. Under Additional Payment Methods, click Add Payment Method
    3. Search for Sezzle
    4. Click the result in the dropdown, then click Sezzle Payments
    5. Click Manage Account
    6. Click Install
  3. Enter your production Sezzle public and private API keys
    • For most merchants, we are able to pre-fill the public and private API keys based on the Shopify store
    • If we cannot uniquely identify the merchant based on the Shopify store, you will be required to fill in the keys
  4. Click Save to verify your Sezzle account
    • You will be redirected to the payment settings page, where you will need to activate Sezzle Payments for your store
  5. Click Activate
  6. Verify Sezzle is available as a payment method for your store
    1 Select Sezzle Checkout Pn
You should see Sezzle Payments installed in your Settings > Payments
Without activating Sezzle Payments, Sezzle will not appear in the checkout, and the installation process is not complete. Verify this step has been completed.
Activate Sezzle

​
Validate

For Sandbox testing, do this step first
  1. Navigate to Settings > Payments > Sezzle Payments
  2. Click Manage, check Enable test mode, and click Save
  3. Click the Manage button in Sezzle Payments, enter your sandbox API keys in the test tab
  4. Click Update settings
For Live testing, do this step first
  1. In the Sezzle configuration page of your Shopify admin, enter the API keys from your Sezzle Merchant Dashboard
  2. Uncheck the Enable Test Mode checkbox
  3. Save the configuration
Step through a test checkout to validate the integration is properly installed.
The Shopify “Accepted Payment Methods” footer widget does not support third-party payment apps by default. To show Sezzle in this section, follow the instructions provided by Shopify, adding 'sezzle' to the list.

​
Troubleshooting

If testing was unsuccessful, review the following: Sezzle Payments Shopify extension is the most updated version
  • Go to Apps > Sezzle Payments, then click About
  • If there is an option to upgrade, do so now
Sezzle gateway is activated
  • Go to Settings > Payment Providers and ensure “Sezzle is active” is listed under the Alternative Payment Methods section
API keys were entered correctly
  • Use the Copy icon in the Sezzle Merchant Dashboard to avoid typos or extra spaces
  • If you have multiple accounts with Sezzle, the merchant ID and API keys are tied to only one URL

​
Uninstall the Sezzle Payments App

  1. Go to Apps
  2. Find Sezzle Payments and click Delete
    3 Delete Jp

​
FAQs

Sezzle aligns with your Shopify Payment Capture settings. If set to Manual, you must manually capture payments for Sezzle orders. Authorization periods differ by merchant, so check the expiration in the Sezzle Merchant Dashboard under Settings > eCommerce and adjust as needed.
Install using an incognito browser. Go to https://your-store.myshopify.com/admin/settings/payments/alternative-providers/1057901, replacing your-store.myshopify.com with your store’s URL. Log in and follow the steps to complete installation. For another store, close and start a new incognito session.
In Shopify, open the order and select Information from the gateway. The payment ID will match the Reference-ID in the Sezzle Merchant Dashboard.
Order Reference ID
Reference ID Dashboard
You can also search Shopify Admin using receipt.payment_id:<payment_id>.
Orders Search
No, Sezzle lacks permissions to view or modify Shopify inventory, so this feature is not supported with the new payment app.