lightning-preapproveinvoice – Ask the HSM to preapprove an invoice (low-level)¶
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.
On success, an empty object is returned.
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