This guide describes how to integrate Affirm into the AmeriCommerce eCommerce platform so that you can provide Affirm as a payment option to your customers. After integrating Affirm, your AmeriCommerce site will:

  • Offer Affirm as payment option on the checkout page
  • Process Affirm charges in your order management system
  • Display Affirm promotional messaging

Before you begin 

Before beginning integration, you should review:

Install and configure Affirm



You may need to input HTML if Affirm doesn't show up.

You'll need include the following HTML in the One Page Checkout. If not, you'll need to add it somewhere inside the payment methods part of the HTML. If you're not sure where to put it, contact [email protected] or click the support widget at the bottom of the screen for further assistance.

  Buy with Monthly Payments

You will be redirected to Affirm to securely complete your purchase once you have clicked Place Order.

API keys and app settings

Once you’ve obtained the public and private API keys from your Affirm Merchant dashboard, go to Tools > Apps & Addons and enter them into your AmeriCommerce online dashboard for Affirm.



Public and Private API keys.

Enter them into your AmeriCommerce online dashboard for Affirm.

Financial Product Key

Leave blank.

Authorize Only

When Authorize Only is enabled, the funds will not be captured at the time the order is placed, only authorized. The funds can be captured later on Admin Order Edit screen.

Affirm Mode

Redirect: Redirects to after the customer clicks place order.

Modal: Enables modal popup after the customer clicks place order.

Enable Confirmation page analytics

Check this box to enable Affirm confirmation page analytics functionality. This sends order details to Affirm after an order is placed.

Affirm Promos

Affirm Logo color and Promotion Type can be setup for the message. See Below.

Add Affirm promotional messaging

You can find the Affirm promotional messaging configuration in the AmeriCommerce online store Apps & Addons dashboard for Affirm.  To enable Affirm messaging, you can check the box next to Shopping Cart & Product Page - Enable Promotional Messaging settings.

Shopping Cart - Enable Promotional Messaging

When enabled, Affirm promotional messaging displays on the shopping cart page. You can set up the Logo Color and Promotion Type on the messaging. You can also customize where to display the message by moving the ##AFFIRMCARTPROMOTION## merge code in your shopping cart theme page. Note: Shopping Cart - Promotion Data ID should be left blank unless otherwise instructed by Affirm.

Product Page - Enable Promotional Messaging

When enabled, Affirm promotional messaging displays on the product detail page. You can set up the Logo Color and Promotion Type on the messaging. You can also customize where to display the message by moving the ##AFFIRMPRODUCTPROMOTION## merge code in your product detail theme page. Note: Product Page - Promotion Data ID should be left blank unless otherwise instructed by Affirm.

Promotional messaging for custom themes

If you have modified your product or cart page templates in the past, you may not be able to see Affirm messaging after enabling the above configurations. Your product and cart page templates may not have Affirm related merge codes and you would then need to use the following instructions to add custom code to get Affirm promotional messaging: 

Add Affirm.js to the global page template

1. Go to Themes > Edit Theme > Head Tags
2. Add the code below:

<!-- Affirm -->
 _affirm_config = {
   public_api_key:  "YOUR_PUBLIC_KEY",
   script:          ""
 (function(l,g,m,e,a,f,b){var d,c=l[m]||{},h=document.createElement(f),n=document.getElementsByTagName(f)[0],k=function(a,b,c){return function(){a[b]._.push([c,arguments])}};c[e]=k(c,e,"set");d=c[e];c[a]={};c[a]._=[];d._=[];c[a][b]=k(c,a,b);a=0;for(b="set add save post open empty reset on off trigger ready setProduct".split(" ");a<b.length;a++)d[b[a]]=k(c,e,b[a]);a=0;for(b=["get","token","url","items"];a<b.length;a++)d[b[a]]=function(){};h.async=!0;h.src=g[f];n.parentNode.insertBefore(h,n);delete g[f];d(g);l[m]=c})(window,_affirm_config,"affirm","checkout","ui","script","ready");
// Use your live public API Key and script to point to Affirm production environment.

Be sure to use your public API key from the sandbox merchant dashboard for public_api_key.

Add an HTML element everywhere you want to display an Affirm promotional messaging component. The element attributes (see below) determine which component displays. We generally recommend adding promotional messaging to your category, product, cart, and payment pages.

In each HTML element, include the new data-page-type attribute corresponding to the page where that promotional messaging component is placed. The data-page-type attribute allows you to customize messaging in the future without development work. By default, promotional messaging on product pages have prequalification enabled, but you can work with your Client Success Manager to change this and configure additional customizations.

Add promotional messaging code

You'll need to edit the HTML on your pages by signing in to the AmeriCommerce admin page and navigating to Themes > Edit > Product Details > HTML Editor. When configuring your promotional messaging, you'll need to use AmeriCommerce's merge codes for the data-amount values. Possible merge codes include:

  • ##RAWPRICE## (product page)
  • ##CARTRAWTOTAL## (cart page)
  • $$PRICE$$

Add promotional messaging to product and cart pages

     var refreshable = document.getElementById('as-low-as-refreshable');
     if (refreshable){
         var amount = "##RAWPRICE##".replace(/[^0-9]+/g,"");
         refreshable.setAttribute('data-amount', amount);
 <p class="affirm-as-low-as" data-amount="##RAWPRICE##" id="as-low-as-refreshable" data-page-type="product"> </p>

Here's a sample code for a variant product page

  //Calculate price to update data-amount value
  function updateAffirmDataAmount (){
      var rawProductPrice = $('.ProductDetailsPricing .ProductDetailsPrice').html();
      rawProductPrice = Math.round(100 * parseFloat(rawProductPrice.replace(/[^0-9\.-]+/g, '')));      
      var refreshable = document.getElementById('as-low-as-refreshable');
      refreshable.setAttribute('data-amount', rawProductPrice);
 //Check if the product price changed
  $(document).on("DOMSubtreeModified", ".ProductDetailsPricing .ProductDetailsPrice", function () {
      updateAffirmDataAmount ();
<p class="affirm-as-low-as" data-amount="" id="as-low-as-refreshable" data-page-type="product"> </p>

Click here for more information on adding Affirm promotional messaging to your site

Add the Confirmation Page function (Optional)

When a customer completes their purchase, you can send their order and product information to Affirm for A/B testing, which will help you optimize your site. Send this information by adding the Confirmation Page function to your payment confirmation page. Click here for all the Confirmation Page function parameters.

To add the function, go to Settings > Orders > General and paste the script below in the Place Order Script box.

    var orderTotal = "##ORDERTOTAL##".replace(/[^0-9]+/g,""){
       "orderId": "##ORDERID##",
       "total": orderTotal,

Function parameters 

Order object






Your internal unique identifier representing the order. Maximum 500 characters.



The total amount of the transaction, including tax and shipping, stated in USD cents (e.g., $100 = 10000).

Review your order management functions

Processing orders (authorize, void, refund, and partial refund) in AmeriCommerce updates the order status in the Affirm dashboard. While you can process orders in the dashboard, we strongly recommend using AmeriCommerce to keep order status synced with Affirm. For more information on processing orders in AmeriCommerce, refer to their documentation.

Coordinate testing with Affirm

Before deploying the Affirm integration to your production site, Affirm will need to test it in your development or staging environment connected to our live environment. Contact your Integration Consultant or merchanth[email protected] to coordinate this test.

Deploy to production

Connect to the live Affirm environment 

Refer back to the AmeriCommerce instructions for connecting to the live Affirm environment.

1. Retrieve your live API keys at
2. Enter the Public API Key and Private API Key you just retrieved from the Affirm merchant dashboard.
3. Uncheck the Use Sandbox box.

Launch to production 

After you've connected to our live environment and we've tested your integration, you're ready to deploy to your production environment and offer Affirm as a payment option to your customers.

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