fetchinvoice -- Command for fetch an invoice for an offer

SYNOPSIS

fetchinvoice offer [amount_msat] [quantity] [recurrence_counter] [recurrence_start] [recurrence_label] [timeout] [payer_note] [payer_metadata] [bip353]

DESCRIPTION

The fetchinvoice RPC command contacts the issuer of an offer to get an actual invoice that can be paid. It highlights any changes between the offer and the returned invoice.

If fetchinvoice-noconnect is not specified in the configuation, it will connect to the destination in the (currently common!) case where it cannot find a route which supports option_onion_messages.

offer (string): Offer string to get an actual invoice that can be paid.
amount_msat (msat, optional): Required if the offer does not specify an amount at all, otherwise it is optional (but presumably if you set it to less than the offer, you will get an error from the issuer).
quantity (u64, optional): Required if the offer specifies quantity_max, otherwise it is not allowed.
recurrence_counter (u64, optional): Required if the offer specifies recurrence, otherwise it is not allowed. recurrence_counter should first be set to 0, and incremented for each successive invoice in a given series.
recurrence_start (number, optional): Indicates what period number to start at (usually 0).
recurrence_label (string, optional): Required if recurrence_counter is set, and otherwise is not allowed. It must be the same as prior fetchinvoice calls for the same recurrence, as it is used to link them together.
timeout (number, optional): If we don't get a reply before this we fail (default, 60 seconds).
payer_note (string, optional): To ask the issuer to include in the fetched invoice.
payer_metadata (string, optional): Derive the payer_id from the specified payer_metadata. Please be sure that payer_metdata can not be derived by anyone, so put some secret into it. (added v24.11)
bip353 (string, optional): BIP353 string (optionally with ₿) indicating where we fetched the offer from (added v25.02)

RETURN VALUE

On success, an object is returned, containing:

invoice (string): The BOLT12 invoice we fetched.
changes (object): Summary of changes from offer.:
- description_appended (string, optional): Extra characters appended to the description field.
- description (string, optional): A completely replaced description field.
- vendor_removed (string, optional): The vendor from the offer, which is missing in the invoice.
- vendor (string, optional): A completely replaced vendor field.
- amount_msat (msat, optional): The amount, if different from the offer amount multiplied by any quantity (or the offer had no amount, or was not in BTC).
next_period (object, optional): Only for recurring invoices if the next period is under the recurrence_limit.:
- counter (u64): The index of the next period to fetchinvoice.
- starttime (u64): UNIX timestamp that the next period starts.
- endtime (u64): UNIX timestamp that the next period ends.
- paywindow_start (u64): UNIX timestamp of the earliest time that the next invoice can be fetched.
- paywindow_end (u64): UNIX timestamp of the latest time that the next invoice can be fetched.

ERRORS

The following error codes may occur:

-1: Catchall nonspecific error.
1002: Offer has expired.
1003: Cannot find a route to the node making the offer.
1004: The node making the offer returned an error message.
1005: We timed out trying to fetch an invoice.

AUTHOR

Rusty Russell rusty@rustcorp.com.au is mainly responsible.

SEE ALSO

lightning-sendinvoice(7), lightning-xpay(7)

RESOURCES

Main web site: https://github.com/ElementsProject/lightning

EXAMPLES

Example 1:

Request:

lightning-cli fetchinvoice -k "offer"="lno1qgsq000bolt210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000" "payer_note"="Thanks for the fish!"

{
  "id": "example:fetchinvoice#1",
  "method": "fetchinvoice",
  "params": {
    "offer": "lno1qgsq000bolt210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000210002100021000",
    "payer_note": "Thanks for the fish!"
  }
}

Response:

{
  "invoice": "lni1qqg0qe01010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101",
  "changes": {}
}

Example 2:

Request:

lightning-cli fetchinvoice -k "offer"="lno1qgsq000bolt220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000" "amount_msat"=2000000 "quantity"=2

{
  "id": "example:fetchinvoice#2",
  "method": "fetchinvoice",
  "params": {
    "offer": "lno1qgsq000bolt220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000220002200022000",
    "amount_msat": 2000000,
    "quantity": 2
  }
}

Response:

{
  "invoice": "lni1qqg0qe02020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202",
  "changes": {}
}