generated: '2026-08-12'
method: searched
source: https://dashboard.sendowl.com/developers/api/sendowl-js
note: >-
  SendOwl's client-side surface is a single first-party JavaScript loader plus a set of hosted checkout
  and storefront surfaces served from transactions.sendowl.com. This is the provider's primary
  integration path for non-developers — the REST API is the deeper, secondary path.
loaders:
- name: sendowl.js
  url: https://transactions.sendowl.com/assets/sendowl.js
  global: sendOwl
  versioned: false
  documentation: https://dashboard.sendowl.com/developers/api/sendowl-js
  description: >-
    "The sendowl.js file is used to provide the checkout in a lightbox on the host site. It also
    contains the cart widget and an API that can be used to control elements of the cart
    programatically."
  note: Unpinned CDN URL — no version in the path and no integrity/SRI guidance published.
families:
- family: Checkout
  components:
  - name: Lightbox / modal checkout
    kind: hosted-overlay
    description: Overlay checkout rendered on the merchant's own page without navigating away;
      activated automatically by including sendowl.js and using SendOwl purchase links or forms.
  - name: Hosted checkout
    kind: hosted-page
    url_pattern: https://transactions.sendowl.com/products/{product_id}/{purchase_key}/purchase
    description: Full-page hosted checkout addressed by product ID plus a per-product purchase key.
  - name: Add-to-cart link
    kind: hosted-page
    url_pattern: https://transactions.sendowl.com/products/{product_id}/{purchase_key}/add_to_cart
    description: Adds an item to the buyer's cart; bundles use /packages/{bundle_id}/{bundle_key}/.
- family: Cart
  components:
  - name: Cart widget
    kind: embeddable-widget
    description: Embeddable shopping cart included in sendowl.js; persists a buyer cart for 30 days of
      inactivity (cartItemCount returns null once the cart has lapsed).
- family: Buttons and links
  components:
  - name: Buy Now / Add to Cart button code
    kind: embed-snippet
    description: Generated HTML button code per product or bundle carrying the product ID and purchase
      key; captured automatically by sendowl.js on page load.
- family: Storefront
  components:
  - name: SendOwl Storefront
    kind: hosted-page
    description: Hosted branded store page listing a merchant's products.
    documentation: https://help.sendowl.com/help/selling-from-a-sendowl-storefront
  - name: Product sales pages
    kind: hosted-page
    description: Per-product hosted landing page with SEO-optimized markup and custom URLs.
javascript_api:
  events:
  - name: sendOwl.abandonCallback
    signature: sendOwl.abandonCallback = function() { ... }
    description: Function called every time a checkout is abandoned.
  methods:
  - name: sendOwl.captureLinks
    signature: sendOwl.captureLinks()
    description: Capture SendOwl link clicks — needed only for AJAX-loaded content added after
      sendowl.js has run.
  - name: sendOwl.captureForms
    signature: sendOwl.captureForms()
    description: Capture SendOwl form submissions — needed only for AJAX-loaded content.
  - name: sendOwl.emptyCart
    signature: sendOwl.emptyCart(merchantID, callback)
    description: Empties the buyer's cart and invokes the callback when complete.
  - name: sendOwl.cartItemCount
    signature: sendOwl.cartItemCount()
    returns: integer, or null when the buyer has not activated a cart in the last 30 days
    description: Returns the number of items in the buyer's cart.
  - name: sendOwl.addProductToCart
    signature: sendOwl.addProductToCart(productID, productKey, callback)
    description: Adds a product to the cart; the callback receives {status, message} where message is
      one of the documented cart error codes.
  - name: sendOwl.addBundleToCart
    signature: sendOwl.addBundleToCart(bundleID, bundleKey, callback)
    description: Adds a bundle (formerly "package") to the cart with the same callback contract.
  error_codes: errors/sendowl-problem-types.yml
customization:
  documented:
  - Custom checkout CSS & JS ("Full visual and behavioral control", pricing page)
  - Custom checkout fields
  - Three mobile-friendly built-in cart templates
  source: https://www.sendowl.com/pricing
x-evidence:
- url: https://dashboard.sendowl.com/developers/api/sendowl-js
  http_status: 200
  fetched: '2026-08-12'
- url: https://transactions.sendowl.com/assets/sendowl.js
  http_status: 200
  fetched: '2026-08-12'