{
  "$schema": "../rpc-schema-draft.json",
  "type": "object",
  "additionalProperties": false,
  "added": "v23.02",
  "rpc": "preapproveinvoice",
  "title": "Ask the HSM to preapprove an invoice (low-level)",
  "description": [
    "The **preapproveinvoice** RPC command submits the *bolt11* invoice to the HSM to check that it is approved for payment.",
    "",
    "Generally the **preapproveinvoice** request does not need to be made explicitly, it is automatically generated as part of a **pay** request.",
    "",
    "By default, the HSM will approve all **preapproveinvoice** requests.",
    "",
    "If a remote signer is being used it might decline an **preapproveinvoice** request because it would exceed velocity controls, is not covered by allowlist controls, was declined manually, or other reasons.",
    "",
    "If a remote signer declines a **preapproveinvoice** request a subsequent attempt to pay the invoice anyway will fail; the signer will refuse to sign the commitment."
  ],
  "request": {
    "required": [
      "bolt11"
    ],
    "properties": {
      "bolt11": {
        "type": "string",
        "description": [
          "Bolt11 invoice to submit to the HSM to check."
        ],
        "added": "v23.02"
      }
    }
  },
  "response": {
    "properties": {}
  },
  "author": [
    "Ken Sedgwick <<ken@bonsai.com>> is mainly responsible."
  ],
  "see_also": [
    "lightning-pay(7)"
  ],
  "resources": [
    "Main web site: <https://github.com/ElementsProject/lightning>"
  ]
}