# MD for: https://www.mercadopago.com.uy/developers/es/docs/checkout-bricks/card-payment-brick/advanced-features/initialize-data-on-the-bricks.md

\> CLIENT\_SIDE > > h1 > > Initialize data on the Bricks ## Initiate Brick with e-mail | Brick | Card Payment Brick | | --- | --- | | Customization moment | When rendering Brick | | Property | initialization.payer.email | | Type | string | | Comments | When a valid email is sent, the email field is hidden. | 

* [javascript ](#editor%5F1)
* [react-jsx ](#editor%5F2)
javascript react-jsx 

```
const settings = {
  initialization: {
  amount: number,
  payer: {
  email: 'string',
  },
  },
  ...
}
```

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```
const initialization = {
 ...,
 payer: {
  ...,
  email: '<PAYER_EMAIL_HERE>',
 },
};
```

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\## Initiate Brick with document | Brick | Card Payment Brick | | --- | --- | | Customization moment | When rendering Brick | | Property | initialization.payer.identification.type & initialization.payer.identification.number | | Type | string | | Comments | When a valid identification.number and a corresponding identification.type are sent, the payer document field is automatically filled in. | 

* [javascript ](#editor%5F3)
* [react-jsx ](#editor%5F4)
javascript react-jsx 

```
const settings = {
  initialization: {
  amount: number,
  payer: {
  identification: {
  type: 'string',
  number: 'string',
  },
  },
  },
  ...
}
```

Copiar 

```
const initialization = {
 ...,
 payer: {
  ...,
  identification: {
  type: 'string',
  number: 'string',
  },
 },
};
```

Copiar