Allocate a bank line to an invoice and post it to the ledger. Body { invoice_id, amount? }; amount caps the allocation in the transaction currency, omitted = full outstanding. Cross-currency is refused. (scope: banking:write)

curl -X POST "https://example.com/banking/transactions/string/match" \  -H "Content-Type: application/json" \  -d '{    "invoice_id": "f4c4edb8-11e0-4b33-bcc1-482dc59ebb32"  }'