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Method provides a script to seamlessly integrate Elements into your web application.

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Installation

Include the initialization script into your application’s main html file. 
<script src="https://static.methodfi.com/elements/v1/stable/init.js"></script>

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Configuration

Once the initialization script has been included into your application, create an instance of the Method class. 
const config = {
  env: 'production', // dev | sandbox | production
  onEvent: (event) => {
    // Invoked for every event triggered by the element.
    // Event is a native MessageEvent instance.
  },
  onSuccess: (payload) => {
    // Invoked when an account has successfully been linked.
    // After accounts are linked, `payload.accounts` will contain a list
    // of public account tokens which you will be exchanged for an
    // account through the Method API.
  },
  onError: (error) => {
    // Invoked when an error is raised during.
  },
  onExit: (payload) => {
    // Invoked when a user exits any element flow, or
    // immediately after an error is raised.
  },
  onOpen : (payload) => {
    // Invoked when an element has successfully launched.
  },
};

const method = new Method(config);

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Configuration Parameters

NameTypeDescription
envstringThe Method environment with which the element with interact with. Options: dev, sandbox, or production. See Elements Environments
onEventFunctionA callback invoked with event, a native MessageEvent, when any event is triggered by the element.
onSuccessFunctionA callback invoked with payload when an element’s flow has successfully been completed. See the success event
onErrorFunctionA callback invoked with error when an error is raised by the element. See the error event.
onExitFunctionA callback invoked with payload when an element exits. See the exit event.
onOpenFunctionA callback invoked with payload when an element is successfully launched. See the open event.
See Method Elements events for more info.

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Launch

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Retrieve an element token

Before you can launch an element, you must first create an element_token for the element through the Method API. In this example, we’re creating an element_token for the Connect Element. 
curl https://production.methodfi.com/elements/token \
  -X POST \
  -H "Method-Version: 2025-07-04" \
  -H "Authorization: Bearer sk_WyZEWVfTcH7GqmPzUPk65Vjc" \
  -H "Content-Type: application/json" \
  -d '{
    "entity_id": "ent_au22b1fbFJbp8",
    "team_name": "Demo Payment App",
    "type": "connect",
    "connect": {
      "products": ["balance"],
    }
  }'

{
  "element_token": "pk_elem_qPmypE9wwphr3WL3yTj7JhxjrPzAmK8G"
}
See create an element token for more info.

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Launch the element

Now that a Method instance and an element_token have been created, you can now launch the element. 
method.open('pk_elem_BtzySdrQGFmLdAPw5gXSQNCxQkhCkT3K');