Korea Invoices (POPBiLL 전자세금계산서 issue, query & NTS transmit)

Issue a Korean 전자세금계산서 (electronic tax invoice) in ONE step (registIssue = 즉시발행) through POPBiLL, and register it. The invoice is issued to the buyer immediately; POPBiLL transmits it to 국세청 (NTS / National Tax Service) automatically the NEXT day (익일전송) unless you call send_to_nts to force it now. The invoicer (seller) 사업자번호, name and CEO come from you; the buyer (invoicee) and the line items come in the arguments. 부가세 (VAT) is computed for you server-side: taxType 과세 = 10% (per-line tax = floor…

Look up a single 전자세금계산서 by its 문서관리번호 (mgt_key) — GET /Taxinvoice/{MgtKeyType}/{MgtKey}. MgtKeyType selects whose box: SELL (you issued it as the seller — default), BUY (you received it as the buyer), TRUSTEE (you issued it as an entrusted agent / 수탁). Returns the document stateCode and a readable state: 200 발행완료 (issued), 300 국세청 전송대기 (queued for NTS — next-day auto-send unless send_to_nts is called), 320 국세청 전송완료 (NTS transmission succeeded — terminal success), 330 국세청 전송실패 (failed), 400 발행취소…

FORCE immediate 국세청 (NTS) transmission of an already-issued 전자세금계산서 — POST /Taxinvoice/{MgtKeyType}/{MgtKey} (override NTS). Normally POPBiLL transmits an issued invoice to NTS automatically the NEXT DAY (익일전송); call this only when you need it sent to the tax authority right now instead of waiting for the next-day batch. It does NOT issue the invoice (create_invoice already did that) and does NOT change the invoice content. Returns whether NTS transmission was accepted; poll query_invoice for st…