# Field IDs

String identifiers used to configure individual fields in the payment form. Accepted by these [options](https://docs.finix.com/js/options):

- `hideFields`
- `requiredFields`
- `labels`
- `placeholders`
- `errorMessages`
- `defaultValues`

Field ID restrictions

`hideFields` cannot hide `number` or `expiration_date` — these are required by card networks. `defaultValues` cannot pre-fill `number`, `expiration_date`, `security_code`, `account_number`, `bank_code`, `institution_number`, or `transit_number` due to PCI compliance.

## Card Fields

Card field IDs

- `card_holder_name`
- `number` — required, cannot be hidden or pre-filled
- `expiration_date` — required, cannot be hidden or pre-filled
- `security_code` — cannot be pre-filled; make optional with `requireSecurityCode: false`

## Bank Fields

Bank field IDs

- `account_holder_name`
- `account_number` — cannot be pre-filled
- `bank_code` — cannot be pre-filled
- `account_type`

## Address Fields

Address field IDs

Only displayed when `showAddress: true`.

- `address_line1`
- `address_line2`
- `address_city`
- `address_region`
- `address_postal_code`
- `address_country`

field-ids.js

```javascript
// Card field IDs for use with hideFields, requiredFields, labels,
// placeholders, errorMessages, and defaultValues options.
//
// Field ID          | Can Hide | Can Pre-fill
// ------------------|----------|-------------
// card_holder_name  | Yes      | Yes
// number            | No       | No (PCI)
// expiration_date   | No       | No (PCI)
// security_code     | Yes      | No (PCI)

Finix.PaymentForm("payment-form", "sandbox", "APgPDQrLD52TYvqazjHJJchM", {
  paymentMethods: ["card"],
  labels: { number: "Card Number", security_code: "CVV" },
  hideFields: ["card_holder_name"],
});

// Bank field IDs
//
// Field ID              | Can Pre-fill
// ----------------------|-------------
// account_holder_name   | Yes
// account_number        | No (PCI)
// bank_code             | No (PCI)
// account_type          | No

Finix.PaymentForm("payment-form", "sandbox", "APgPDQrLD52TYvqazjHJJchM", {
  paymentMethods: ["bank"],
  labels: { account_holder_name: "Account Holder" },
  defaultValues: { account_holder_name: "Jane Smith" },
});

// Address field IDs — only shown when showAddress: true

Finix.PaymentForm("payment-form", "sandbox", "APgPDQrLD52TYvqazjHJJchM", {
  showAddress: true,
  defaultValues: {
    address_line1: "123 Main St",
    address_city: "San Francisco",
    address_region: "CA",
    address_postal_code: "94105",
    address_country: "USA",
  },
});
```