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

# set_default_payment_method

> Choose which saved payment method funds new cards.

Sets which saved payment method is the default used to fund new cards. Find the right `payment_method_id` with [list\_payment\_methods](/companies/mcp/tools/list_payment_methods) first.

## Parameters

| Parameter           | Type   | Required | Description                                               |
| ------------------- | ------ | -------- | --------------------------------------------------------- |
| `payment_method_id` | string | Yes      | The payment method ID to make the default, like `pm_xxx`. |

## Returns

A confirmation that the default was updated, echoing the `paymentMethodId` with `status: "set_default"`. From then on, new cards are funded by that payment method.

## Example

```json theme={null}
{ "name": "set_default_payment_method", "arguments": { "payment_method_id": "pm_1AbCdEfGhIjKlMnO" } }
```