PayPay

PayPay is Japan's largest QR/barcode mobile-payment network (a SoftBank / Yahoo Japan / Paytm joint venture) with tens of millions of users. Its Open Payment API (OPA v2) lets payment partners and merchants collect payments from PayPay wallet users through dynamic QR codes, web checkout (Web Cashier), app-invoke deep links, and a pre-authorize-and-capture flow. The REST API (base //apigw.paypay.ne.jp) is secured with HMAC-SHA256 request signatures, settles in JPY, sends transaction webhooks plus daily reconciliation files, and ships official Node, PHP, Python and Java SDKs under the github.com/paypay organization.

PayPay publishes 2 APIs on the APIs.io network: Payment API and Payments API. Tagged areas include Company, Fintech, Payments, Mobile Payments, and QR Code Payments.

The PayPay catalog on APIs.io includes 1 event-driven AsyncAPI specification.

PayPay’s developer surface includes documentation, API reference, getting-started guide, signup flow, support, authentication, changelog, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

34.3/100 thin ▬ flat Agent 30/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Fintech Payments Mobile Payments QR Code Payments Digital Wallet Japan Merchant Payments

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 34.3/100 · thin

Contract Quality 10.1 / 19

Developer Ergonomics 7.4 / 15

Access Clarity 0.0 / 15

Operational Transparency 3.3 / 10

Contract Governance 0.4 / 9

Discoverability 5.7 / 8

Regulatory Posture 4.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/paypay: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

PayPay Payment API

Everything involved in the payment life cycle

PayPay Payments API

The Payments API from PayPay — 1 operation(s) for payments.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Dynamic QR Payment API

OPEN COLLECTION

Dynamic QR Payment Payments API

OPEN COLLECTION

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Paypay Webhooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Paypay Authentication

http/hmac · 2 schemes

SECURITY

Paypay Domain Security

TLSv1.3

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Paypay Agentic Access

10 operations · 7 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

AgentSkill

LLMsTxt

AgenticAccess

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Lifecycle

DataModel

Webhooks

Conformance

Scroll for all 7

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

DeclineCodes

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support

Support

Deprecation

Deprecation

ChangeLog

ChangeLog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: paypay
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/paypay.png
name: PayPay
description: PayPay is Japan's largest QR/barcode mobile-payment network (a SoftBank / Yahoo Japan / Paytm joint venture)
  with tens of millions of users. Its Open Payment API (OPA v2) lets payment partners and merchants collect payments from
  PayPay wallet users through dynamic QR codes, web checkout (Web Cashier), app-invoke deep links, and a pre-authorize-and-capture
  flow. The REST API (base //apigw.paypay.ne.jp) is secured with HMAC-SHA256 request signatures, settles in JPY, sends transaction
  webhooks plus daily reconciliation files, and ships official Node, PHP, Python and Java SDKs under the github.com/paypay
  organization.
url: https://raw.githubusercontent.com/api-evangelist/paypay/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- softbank-vision-fund
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Fintech
- Payments
- Mobile Payments
- QR Code Payments
- Digital Wallet
- Japan
- Merchant Payments
apis:
- aid: paypay:paypay-payment-api
  name: PayPay Payment API
  description: Everything involved in the payment life cycle
  humanURL: https://developer.paypay.ne.jp/
  baseURL: https://apigw.paypay.ne.jp
  tags:
  - Payment
  properties:
  - type: OpenAPI
    url: openapi/paypay-payment-api-openapi.yml
  - type: APIReference
    url: https://www.paypay.ne.jp/opa/doc/v1.0/dynamicqrcode
- aid: paypay:paypay-payments-api
  name: PayPay Payments API
  description: The Payments API from PayPay — 1 operation(s) for payments.
  humanURL: https://developer.paypay.ne.jp/
  baseURL: https://apigw.paypay.ne.jp
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/paypay-payments-api-openapi.yml
  - type: APIReference
    url: https://www.paypay.ne.jp/opa/doc/v1.0/dynamicqrcode
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DeveloperPortal
  url: https://developer.paypay.ne.jp/
- type: Documentation
  url: https://www.paypay.ne.jp/opa/doc/v1.0/dynamicqrcode
- type: APIReference
  url: https://www.paypay.ne.jp/opa/doc/v1.0/dynamicqrcode
- type: GettingStarted
  url: https://developer.paypay.ne.jp/
- type: SignUp
  url: https://developer.paypay.ne.jp/
- type: Support
  url: https://integration.paypay.ne.jp/hc/en-us
- type: GitHubOrganization
  url: https://github.com/paypay
- type: OpenAPI
  url: openapi/_original/paypay-opa-openapi-original.json
- type: Overlay
  url: overlays/paypay-opa-overlay.yaml
- type: Authentication
  url: authentication/paypay-authentication.yml
- type: Packages
  url: packages/paypay-packages.yml
- type: SDKs
  url: packages/paypay-packages.yml
- type: Conventions
  url: conventions/paypay-conventions.yml
- type: Idempotency
  url: conventions/paypay-conventions.yml
- type: ErrorCatalog
  url: errors/paypay-problem-types.yml
- type: DeclineCodes
  url: errors/paypay-decline-codes.yml
- type: Lifecycle
  url: lifecycle/paypay-lifecycle.yml
- type: Deprecation
  url: lifecycle/paypay-lifecycle.yml
- type: ChangeLog
  url: changelog/paypay-changelog.yml
- type: DataModel
  url: data-model/paypay-data-model.yml
- type: Webhooks
  url: asyncapi/paypay-webhooks.yml
- type: X-MCPServerCandidate
  url: mcp/paypay-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Conformance
  url: conformance/paypay-conformance.yml
- type: Sandbox
  url: sandbox/paypay-sandbox.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/paypay-llms.txt
- type: DomainSecurity
  url: security/paypay-domain-security.yml
- type: AgenticAccess
  url: agentic-access/paypay-agentic-access.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 19
  pass: local-v1

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