# PortOne B2 B API

**Canonical:** https://apis.io/apis/portone/portone-b2-b-api/  
**Provider:** PortOne — https://apis.io/providers/portone/  
**Base URL:** https://api.iamport.kr  
**Documentation:** https://developers.portone.io/api/rest-v1

PortOne B2 B API is one of 20 APIs that [PortOne](https://apis.io/providers/portone/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include B2B. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

The B2 B API from PortOne — 26 operation(s) for b2 b.

## Operations (31)

| Method | Path | Summary |
|---|---|---|
| GET | `/b2b/bulk-tax-invoices/{bulkTaxInvoiceId}` | 일괄 세금계산서 조회 |
| POST | `/b2b/companies/business-info` | 사업자등록 정보 조회 |
| GET | `/b2b/counterparties/{brn}/certificate/registration-url` | 사업자 인증서 등록 URL 조회 |
| POST | `/b2b/counterparties/{brn}/certificate/validate` | 사업자 인증서 유효성 검증 |
| GET | `/b2b/counterparties/{brn}/certificate` | 인증서 조회 |
| GET | `/b2b/counterparties/{counterpartyId}` | 거래처 조회 |
| DELETE | `/b2b/counterparties/{counterpartyId}` | 거래처 삭제 |
| PATCH | `/b2b/counterparties/{counterpartyId}` | 거래처 정보 수정 |
| GET | `/b2b/counterparties` | 거래처 검색 |
| POST | `/b2b/counterparties` | 거래처 생성 |
| POST | `/b2b/file-upload-url` | 파일 업로드 URL 생성 |
| GET | `/b2b/tax-invoices-sheet` | 세금계산서 엑셀 파일(csv) 다운로드 |
| PUT | `/b2b/tax-invoices/draft` | 세금계산서 임시저장 수정 |
| POST | `/b2b/tax-invoices/draft` | 세금계산서 임시 저장 |
| POST | `/b2b/tax-invoices/issue-immediately` | 세금계산서 즉시 정발행 |
| POST | `/b2b/tax-invoices/request-reverse-issuance` | 세금계산서 역발행 즉시 요청 |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/attach-file` | 세금계산서 파일 첨부 |
| DELETE | `/b2b/tax-invoices/{taxInvoiceKey}/attachments/{attachmentId}` | 세금계산서 첨부파일 삭제 |
| GET | `/b2b/tax-invoices/{taxInvoiceKey}/attachments` | 세금계산서 첨부파일 목록 조회 |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/cancel-issuance` | 세금계산서 취소 (공급자에 의한 취소) |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/cancel-request` | 세금계산서 역발행 요청 취소 (공급받는자에 의한 취소) |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/issue` | 세금계산서 발행 승인 |
| GET | `/b2b/tax-invoices/{taxInvoiceKey}/pdf-download-url` | 세금 계산서 PDF 다운로드 URL 조회 |
| GET | `/b2b/tax-invoices/{taxInvoiceKey}/popup-url` | 세금 계산서 팝업 URL 조회 |
| GET | `/b2b/tax-invoices/{taxInvoiceKey}/print-url` | 세금 계산서 프린트 URL 조회 |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/refuse-request` | 세금계산서 역발행 요청 거부 |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/request` | 세금계산서 역발행 요청 |
| POST | `/b2b/tax-invoices/{taxInvoiceKey}/send-to-nts` | 세금계산서 국세청 즉시 전송 |
| GET | `/b2b/tax-invoices/{taxInvoiceKey}` | 세금 계산서 조회 |
| DELETE | `/b2b/tax-invoices/{taxInvoiceKey}` | 세금계산서 삭제 |
| GET | `/b2b/tax-invoices` | 세금 계산서 다건조회 |

## Machine-readable artifacts (11)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/portone/refs/heads/main/openapi/portone-b2-b-api-openapi.yml
- **Documentation** — https://developers.portone.io/api/rest-v2/payment
- **APIReference** — https://developers.portone.io/api/rest-v2
- **PostmanCollection** — https://raw.githubusercontent.com/api-evangelist/portone/refs/heads/main/collections/portone.postman_collection.json
- **Documentation** — https://developers.portone.io/api/rest-v2/payment.billingKey
- **Documentation** — https://developers.portone.io/api/rest-v2/paymentSchedule
- **Documentation** — https://developers.portone.io/api/rest-v2/identityVerification
- **Documentation** — https://developers.portone.io/api/rest-v2/cashReceipt
- **Documentation** — https://developers.portone.io/api/rest-v2/b2b
- **Documentation** — https://developers.portone.io/api/rest-v2/platform
- **Documentation** — https://developers.portone.io/api/rest-v2/paymentSession

## Other PortOne APIs (12)

- [PortOne REST API (V1, legacy Iamport)](https://apis.io/apis/portone/portone-rest-api-v1/)
- [PortOne Banks API](https://apis.io/apis/portone/portone-banks-api/)
- [PortOne Billing Keys API](https://apis.io/apis/portone/portone-billing-keys-api/)
- [PortOne Cash Receipts API](https://apis.io/apis/portone/portone-cash-receipts-api/)
- [PortOne Checkout Profiles API](https://apis.io/apis/portone/portone-checkout-profiles-api/)
- [PortOne Identity Verifications API](https://apis.io/apis/portone/portone-identity-verifications-api/)
- [PortOne Kakaopay API](https://apis.io/apis/portone/portone-kakaopay-api/)
- [PortOne Login API](https://apis.io/apis/portone/portone-login-api/)
- [PortOne Payment Events By Cursor API](https://apis.io/apis/portone/portone-payment-events-by-cursor-api/)
- [PortOne Payment Gateways API](https://apis.io/apis/portone/portone-payment-gateways-api/)
- [PortOne Payment Reconciliations API](https://apis.io/apis/portone/portone-payment-reconciliations-api/)
- [PortOne Payment Schedules API](https://apis.io/apis/portone/portone-payment-schedules-api/)

## Tags

B2B

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/portone/portone-b2-b-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/portone/.