> **Key takeaway:**  ☞   The renaming of "Ledger Live" to "Ledger Wallet" and\
>      "wallet" (in the hardware sense) to "signer" is still in progress.\
>      This page may contain legacy references that will be updated.

# Provider's LiveApp

As explained in the [Card Integration](../../card) page, you need to modify your LiveApp with some specific adjustments compared to the one found in the Discover section.

Your LiveApp must:

- Use the Ledger's [exchangeSDK](https://github.com/LedgerHQ/exchange-sdk), in addition to the Wallet API.
- Have a modified, slightly more complex, Manifest file.
- Follow specific flow/ux requirements.

## Ledger Exchange Services Kit

To learn how to create (or embed if already existing) your user interface for the card, please follow the [Discover documentation](../../discover/getting-started).

Your LiveApp will interact with , through the [ExchangeSDK](https://github.com/LedgerHQ/exchange-sdk), with the corresponding method.

You will need to set up the SDK with your `providerId` attributed upon request by Ledger.

```js copy
const exchangeSDK = new ExchangeSDK("yourProviderId");
```

### CARD method

This method will need you to provide the following parameters:

- `quoteId`: The id coming from your system.
- `fromAccountId`: User's Ledger account id.
- `fromAmount`: Amount that will be sold.
- `toFiat`: Fiat currency that the user wants to be paid with using provider id.
- `rate`: The crypto/fiat rate.

```js copy
exchangeSDK.sell({
  quoteId: "123abc",
  fromAccountId: "97f06be9-6fb2-5da3-be71-4e762ed6e115", // <Glossary word='Ledger Wallet'></Glossary> uuid4 account (can be a BTC account)
  fromAmount: new BigNumber(1),
  toFiat: "EUR", // provider fiat id
  rate: 66564, // crypto/fiat rate [BTC/EUR]
  type: "card",
});
```

> **Note:** Ledger needs to know how to send referral information through the widget.

## Manifest Permission

Your [LiveApp manifest](../../../../docs/discover/wallet-api/appendix/manifest) should contains at least those permissions request:

```json copy
"permissions": [
  "account.list",
  "currency.list",
  "custom.exchange.start",
  "custom.exchange.complete",
  "custom.exchange.error",
]
```

## Key Generation for Production and Test Environments

To ensure secure communication, you must generate two sets of keys: one for the production environment and one for the test environment. Follow the steps below to generate these keys:

# Testing with the Development Key

After submitting [your keys](/docs/ledger-live/exchange/card/providers-backend#generate-privatepublic-key) to us and once the CAL team has successfully integrated them, you can proceed to test your integration in .

### Steps to Test in Ledger Wallet

1. Open the **Settings** menu in .
2. Navigate to the **Developer** tab.
3. Locate the setting labeled **Exchange in Test Partner Mode**.
4. Enable this setting to activate the test environment.

![Payload and Payload Signature generation diagram](/exchange/exchange-dev-mode.png)

With this mode enabled, you can verify the functionality of your keys and ensure everything is working as expected in the test environment.