generated: '2026-06-20'
method: searched
source: https://dev.shift4.com/docs/js/ + https://docs.shift4.com
notes: >-
  Client-side / embeddable surfaces Shift4 publishes for collecting card data
  without it touching the merchant server (PCI scope reduction). Distinct from
  the server-side SDKs in packages/shift4-packages.yml.
components:
  - family: Shift4.js
    kind: hosted tokenization JS library
    description: >-
      Browser JS library that tokenizes card data client-side against the
      dev.shift4.com (e-commerce) API before it reaches the merchant server,
      plus components/utilities for building secure checkout.
    loader: https://js.dev.shift4.com/shift4.js
    docs: https://dev.shift4.com/docs/js/
  - family: i4Go
    kind: hosted iFrame tokenization (Payment Platform)
    description: >-
      Shift4's TrueTokenization / i4Go hosted client that presents a secure,
      Shift4-hosted card-entry field (authorizeClient / preauthorizeClient)
      keyed by the merchant Access Token, so PAN data is captured directly by
      Shift4 for the Payment Platform / Gateway REST API.
    docs: https://docs.shift4.com
  - family: Hosted Payment Links
    kind: hosted payment page
    description: >-
      Shift4-hosted shareable payment link pages created via the Payment Links
      API — no client-side integration required to collect a payment.
    docs: https://docs.shift4.com/guides/core-concepts/payment-links
  - family: Hosted Checkout Sessions
    kind: hosted checkout page
    description: >-
      Shift4-hosted checkout session pages created via the Checkout Sessions API
      for online payment collection.
    docs: https://docs.shift4.com/apis/payments-platform-rest/openapi