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

# Manage Card-Linked Internal Wallets

> Link or unlink custodial wallets to cards for payment processing

## Overview

Link internal (custodial) wallets to your card to use them as funding sources for card transactions. Users can link up to 5 wallets, with priority determining the order in which they are charged during purchases.

**Use Cases:**

* Enable card payments from specific wallets
* Manage which currencies fund card transactions
* Control payment source priority
* Temporarily disable wallet usage for cards

***

## GET - List Card-Linked Wallets

Retrieve all custodial wallets currently linked to the user's card.

### Authentication

<ParamField header="x-client-key" type="string" required>
  Your public API client key
</ParamField>

<ParamField header="Authorization" type="string" required>
  Bearer token for authentication
</ParamField>

### Response

<ResponseField name="id" type="string">
  Linked wallet identifier
</ResponseField>

<ResponseField name="address" type="string">
  Wallet blockchain address
</ResponseField>

<ResponseField name="currency" type="string">
  Currency code (e.g., "sol", "usdc")
</ResponseField>

<ResponseField name="network" type="string">
  Blockchain network (e.g., "solana", "ethereum")
</ResponseField>

<ResponseField name="priority" type="number">
  Charging priority (lower numbers charged first)
</ResponseField>

<ResponseExample>
  ```json 200 - Success theme={null}
  [
    {
      "id": "1693a6da-5945-4461-ba1c-0b9891f78848",
      "address": "DfKNsYfrCEHb7ScJkuMTtPTeDiyjmBBm9NMHnbR7uFHz",
      "currency": "sol",
      "network": "solana",
      "priority": 1
    },
    {
      "id": "7c1839ee-918e-4787-b74f-deeb48ead58b",
      "address": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb4",
      "currency": "usdc",
      "network": "ethereum",
      "priority": 2
    }
  ]
  ```
</ResponseExample>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X GET "https://dev.api.baanx.com/v1/wallet/internal/card_linked" \
    -H "x-client-key: YOUR_CLIENT_KEY" \
    -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
  ```

  ```python Python theme={null}
  import requests

  url = "https://dev.api.baanx.com/v1/wallet/internal/card_linked"
  headers = {
      "x-client-key": "YOUR_CLIENT_KEY",
      "Authorization": "Bearer YOUR_ACCESS_TOKEN"
  }

  response = requests.get(url, headers=headers)
  linked_wallets = response.json()

  print(f"Linked wallets: {len(linked_wallets)}")
  for wallet in sorted(linked_wallets, key=lambda w: w['priority']):
      print(f"{wallet['priority']}. {wallet['currency'].upper()} on {wallet['network']}")
  ```

  ```typescript TypeScript theme={null}
  interface LinkedWallet {
    id: string;
    address: string;
    currency: string;
    network: string;
    priority: number;
  }

  async function getLinkedWallets(): Promise<LinkedWallet[]> {
    const response = await fetch(
      'https://dev.api.baanx.com/v1/wallet/internal/card_linked',
      {
        headers: {
          'x-client-key': 'YOUR_CLIENT_KEY',
          'Authorization': 'Bearer YOUR_ACCESS_TOKEN'
        }
      }
    );

    return await response.json();
  }
  ```
</CodeGroup>

***

## POST - Link Internal Wallet to Card

Link a custodial wallet to the card as a payment source. Each user can link up to 5 wallets.

### Request Body

<ParamField body="addressId" type="string" required>
  Wallet addressId from GET /v1/wallet/internal response
</ParamField>

### Response

<ResponseField name="success" type="boolean">
  Whether linking was successful
</ResponseField>

<ResponseExample>
  ```json 201 - Created theme={null}
  {
    "success": true
  }
  ```

  ```json 422 - Validation Error theme={null}
  {
    "message": "Maximum 5 wallets can be linked"
  }
  ```
</ResponseExample>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X POST "https://dev.api.baanx.com/v1/wallet/internal/card_linked" \
    -H "x-client-key: YOUR_CLIENT_KEY" \
    -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
    -H "Content-Type: application/json" \
    -d '{
      "addressId": "7c1839ee-918e-4787-b74f-deeb48ead58b"
    }'
  ```

  ```python Python theme={null}
  import requests

  all_wallets = requests.get(
      "https://dev.api.baanx.com/v1/wallet/internal",
      headers=headers
  ).json()

  usdc_wallet = next(w for w in all_wallets if w['currency'] == 'usdc')

  link_data = {"addressId": usdc_wallet['addressId']}
  response = requests.post(
      "https://dev.api.baanx.com/v1/wallet/internal/card_linked",
      headers=headers,
      json=link_data
  )

  if response.status_code == 201:
      print("Wallet linked to card successfully!")
  ```

  ```typescript TypeScript theme={null}
  async function linkWalletToCard(addressId: string): Promise<boolean> {
    const response = await fetch(
      'https://dev.api.baanx.com/v1/wallet/internal/card_linked',
      {
        method: 'POST',
        headers: {
          'x-client-key': 'YOUR_CLIENT_KEY',
          'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({ addressId })
      }
    );

    const result = await response.json();
    return result.success;
  }
  ```
</CodeGroup>

***

## DELETE - Unlink Internal Wallet from Card

Remove a wallet from card payment sources. The wallet remains available but won't be used for card transactions.

### Request Body

<ParamField body="addressId" type="string" required>
  Wallet addressId to unlink
</ParamField>

### Response

<ResponseField name="success" type="boolean">
  Whether unlinking was successful
</ResponseField>

<ResponseExample>
  ```json 200 - Success theme={null}
  {
    "success": true
  }
  ```
</ResponseExample>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X DELETE "https://dev.api.baanx.com/v1/wallet/internal/card_linked" \
    -H "x-client-key: YOUR_CLIENT_KEY" \
    -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
    -H "Content-Type: application/json" \
    -d '{
      "addressId": "7c1839ee-918e-4787-b74f-deeb48ead58b"
    }'
  ```

  ```python Python theme={null}
  unlink_data = {"addressId": "7c1839ee-918e-4787-b74f-deeb48ead58b"}
  response = requests.delete(
      "https://dev.api.baanx.com/v1/wallet/internal/card_linked",
      headers=headers,
      json=unlink_data
  )

  if response.status_code == 200:
      print("Wallet unlinked from card")
  ```

  ```typescript TypeScript theme={null}
  async function unlinkWalletFromCard(addressId: string): Promise<boolean> {
    const response = await fetch(
      'https://dev.api.baanx.com/v1/wallet/internal/card_linked',
      {
        method: 'DELETE',
        headers: {
          'x-client-key': 'YOUR_CLIENT_KEY',
          'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({ addressId })
      }
    );

    const result = await response.json();
    return result.success;
  }
  ```
</CodeGroup>

***

## Complete Management Flow

<CodeGroup>
  ```javascript Full Wallet Management theme={null}
  async function manageCardWallets() {
    const allWallets = await fetch('/v1/wallet/internal')
      .then(r => r.json());

    const linkedWallets = await fetch('/v1/wallet/internal/card_linked')
      .then(r => r.json());

    const usdcWallet = allWallets.find(w => w.currency === 'usdc');

    const isLinked = linkedWallets.some(
      w => w.address === usdcWallet.address
    );

    if (!isLinked && linkedWallets.length < 5) {
      await fetch('/v1/wallet/internal/card_linked', {
        method: 'POST',
        body: JSON.stringify({ addressId: usdcWallet.addressId })
      });
      console.log('USDC wallet linked to card');
    }

    const orderedWallets = linkedWallets.sort((a, b) => a.priority - b.priority);
    console.log('Payment priority:', orderedWallets.map(w => w.currency));

    return {
      total: allWallets.length,
      linked: linkedWallets.length,
      available: 5 - linkedWallets.length
    };
  }
  ```
</CodeGroup>

## Important Notes

<Note>
  **Maximum Limit**: Users can link up to 5 wallets to their card. Attempting to link more will result in an error.
</Note>

<Tip>
  **Priority Management**: Use the [Update Linked Wallets Priority](/api-reference/wallet/internal-card-linked-priority) endpoint to control which wallet is charged first.
</Tip>

<Warning>
  **Unlinking Effects**: Unlinking a wallet doesn't delete it, only removes it as a card payment source. The wallet and its funds remain accessible.
</Warning>

## Related Endpoints

* [Update Linked Wallet Priority](/api-reference/wallet/internal-card-linked-priority) - Change charging order
* [Get Internal Wallets](/api-reference/wallet/internal) - View all available wallets