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CancelPayment

An MCP tool from the Square API server, hosted on mcp.hjlabs.in.

CancelPayment Cancels (voids) a payment. You can use this endpoint to cancel a payment with the APPROVED status. [POST /v2/payments/{payment_id}/cancel]

Name on the gateway: square_api__cancel_payment · may change things.

Parameters

NameTypeDescription
payment_id requiredstringThe ID of the payment to cancel.

How to call it

Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:

call_tool arguments
{
  "name": "square_api__cancel_payment",
  "arguments": {
    "payment_id": "…"
  }
}

Or connect the Square API server directly, which lists 308 tools including this one:

Run in your terminal
claude mcp add --transport http hj-square-api https://mcp.hjlabs.in/mcp/square-api \
  --header "Authorization: Bearer YOUR_API_KEY"

Try asking

Use the cancelpayment tool with payment_id set to ….

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