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

\> CLIENT\_SIDE > > h1 > > Initialize data on the Bricks ## Cards In the form displayed for payment by card, you can start with the \*\*document\*\* and \*\*email\*\* fields already filled in. For this, it is necessary to pass the following configuration in the Brick's initialization object. 

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

```
settings = {
  ...,
  initialization: {
  ...,
  payer: {
  ...,
  email: '<PAYER_EMAIL_HERE>',
  identification: {
  type: 'string',
  number: 'string',
  },
  }
  }
}
```

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

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