set_default_payment_method

Connect to https://mcp.agentcard.sh/mcp with the user’s connection token (or a buy_token for org-owned accounts). Behavior: idempotent.

Not in the default tools/list. It is still callable by exact name, and appears when the client sends the x-expert-tools: 1 header.

What it does

Set which saved payment method is the default charged for flight bookings. Use list_payment_methods to find the payment_method_id.

Field	Type	Description
`payment_method_id` (required)	string	The payment method ID to make the default (e.g. pm_xxx)

Field	Type	Description
`message` (required)	string	Human-readable summary of the result.
`paymentMethodId`	string	The payment method ID now set as default (e.g. pm_xxx).
`status`	string: `set_default`	Outcome of the operation.

{
  "tool": "set_default_payment_method",
  "arguments": {
    "payment_method_id": "\u2026"
  }
}