> ## Documentation Index
> Fetch the complete documentation index at: https://docs.methodfi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Update an MX Verification

export const ParamList = ({items = [], is_child = false}) => {
  return items.map(item => {
    const field_props = {
      id: Math.random().toString(),
      body: item.name,
      name: item.name,
      type: item.type,
      required: item.required
    };
    const enums = item.enums || [];
    const items = item.items || [];
    const has_items = items?.length > 0;
    const has_enums = enums?.length > 0;
    const should_default_open = item.defaultOpen || false;
    const render_child_item = () => {
      const child_props = {
        title: has_enums ? "Possible enum values" : "properties"
      };
      if (should_default_open) child_props.defaultOpen = true;
      const has_inline_enums = has_enums && enums.every(enum_item => typeof enum_item === 'string') && enums.map((enum_item, idx) => {
        const is_last = idx === enums.length - 1;
        const is_2nd_to_last = idx === enums.length - 2;
        return <>
            <code>{enum_item}</code>
            {is_last && ''}
            {is_2nd_to_last && ' or '}
            {!is_last && !is_2nd_to_last && ', '}
          </>;
      });
      const enum_list = has_enums && !has_inline_enums && <Accordion {...child_props}>
          {enums.map((enum_item, index) => <div key={`enum-${index}`}>
              <code>{enum_item.name}</code>
              <br />
              <p>{enum_item.description}</p>
            </div>)}
        </Accordion>;
      const item_list = has_items && <Expandable {...child_props}>
          <ParamList items={items || []} is_child />
        </Expandable>;
      return <>
          <p>
            {item.description}
            {has_inline_enums && [has_inline_enums.length > 1 ? ' One of ' : ' Must be ', ...has_inline_enums]}
          </p>

          {enum_list}
          {item_list}
        </>;
    };
    return is_child ? <ResponseField {...field_props}>{render_child_item()}</ResponseField> : <ParamField {...field_props}>{render_child_item()}</ParamField>;
  });
};

Updates an existing AccountVerificationSession object of type `mx`.

## Path Parameters

<ParamList
  items={[
{
name: 'acc_id',
type: 'string',
required: true,
description: 'ID of the Account.',
},
{
name: 'avf_id',
type: 'string',
required: true,
description: 'ID of the AccountVerificationSession.',
},
]}
/>

## Body

<ParamList
  items={[
{
name: 'mx',
type: 'object',
required: true,
description: '',
items: [
  {
    name: 'mx.account',
    type: "object",
    required: true,
    description: (<>The raw account data received from MX. See <a href="https://docs.mx.com/reference/platform-reference/reference/account-fields">account balances</a>.</>),
  },
  {
    name: 'mx.transactions',
    type: "object[]",
    required: true,
    description: (<>The list of the raw transaction data received from MX. See <a href="https://docs.mx.com/reference/platform-reference/reference/transaction-fields">account transactions</a>.</>),
  },
],
},
]}
/>

## Returns

Returns an AccountVerificationSession object.

<RequestExample>
  ```bash cURL theme={null}
  curl https://production.methodfi.com/accounts/acc_yVf3mkzbhz9tj/verification_sessions/avf_DjkdemgTQfqRD \
    -X PUT \
    -H "Method-Version: 2026-03-30" \
    -H "Authorization: Bearer sk_WyZEWVfTcH7GqmPzUPk65Vjc" \
    -H "Content-Type: application/json" \
    -d '{
      "mx": {
        "account" : {
          "institution_code": "chase",
          "guid": "ACT-06d7f44b-caae-0f6e-1384-01f52e75dcb1",
          "account_number": null,
          "apr": null,
          "apy": null,
          "available_balance": 1000.23,
          "available_credit": null,
          "balance": 1000.23,
          "cash_balance": 1000.32,
          "cash_surrender_value": 1000.23,
          "created_at": "2016-10-13T17:57:37+00:00",
          ...
        },
        "transactions": [
          ...
        ]
    }'
  ```

  ```javascript Node.js theme={null}
  const response = await method
    .accounts('acc_yVf3mkzbhz9tj')
    .verificationSessions
    .update('avf_DjkdemgTQfqRD', {
      mx: {
        account: {
          institution_code: 'chase',
          guid: 'ACT-06d7f44b-caae-0f6e-1384-01f52e75dcb1',
          account_number: null,
          apr: null,
          apy: null,
          available_balance: 1000.23,
          available_credit: null,
          balance: 1000.23,
          cash_balance: 1000.32,
          cash_surrender_value: 1000.23,
          created_at: '2016-10-13T17:57:37+00:00',
          ...
        },
        transactions: [
          ...
        ]
      }
    });
  ```

  ```python Python theme={null}
  response = method
    .accounts('acc_yVf3mkzbhz9tj')
    .verification_sessions
    .update('avf_DjkdemgTQfqRD', {
      'mx': {
        'account': {
          'institution_code': 'chase',
          'guid': 'ACT-06d7f44b-caae-0f6e-1384-01f52e75dcb1',
          'account_number': None,
          'apr': None,
          'apy': None,
          'available_balance': 1000.23,
          'available_credit': None,
          'balance': 1000.23,
          'cash_balance': 1000.32,
          'cash_surrender_value': 1000.23,
          'created_at': '2016-10-13T17:57:37+00:00',
          ...
        },
        'transactions': [
          ...
        ]
      }
    })
  ```
</RequestExample>

<ResponseExample>
  ```json theme={null}
  {
    "id": "avf_DjkdemgTQfqRD",
    "account_id": "acc_yVf3mkzbhz9tj",
    "status": "verified",
    "error": null,
    "type": "mx",
    "mx": {
      "account": {
        "institution_code": "chase",
        "guid": "ACT-06d7f44b-caae-0f6e-1384-01f52e75dcb1",
        "account_number": null,
        "apr": null,
        "apy": null,
        "available_balance": 1000.23,
        "available_credit": null,
        "balance": 1000.23,
        "cash_balance": 1000.32,
        "cash_surrender_value": 1000.23,
        "created_at": "2016-10-13T17:57:37+00:00",
        ...
      },
      "transactions": [ ... ]
    },
    "created_at": "2024-03-14T02:02:24.862Z",
    "updated_at": "2024-03-14T02:02:24.862Z"
  }
  ```
</ResponseExample>