Payer
Payer provides a modern B2B payments platform that automates order-to-cash processes, offering flexible payment methods, invoicing, and reconciliation. Their solution helps financial, commercial, and technical leaders accelerate cash flow, reduce manual effort, and enable new business models. The platform includes APIs for payment initiation, invoice management, and reporting, aiming to streamline payments for enterprises.
Payer is listed with 17 APIs on the APIs.io network, including All API, Audit API, and 15 more. Tagged areas include Company, Payments, B2B, Fintech, and Automation.
The Payer catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.
Payer’s developer surface includes authentication, getting-started guide, documentation, API reference, engineering blog, pricing, support, and 13 more developer resources.
Kin Score
Kin Score
How this is scored →scored 2026-11-06 · rubric v0.27.0
It updates itself when the score changes. Paste this where you link to your API docs:
<a href="https://apis.io/providers/payer/"><img src="https://apis.io/badge/payer/card.svg" alt="Payer on APIs.io — Kin Score by API Evangelist"></a>Other styles, a README pill and a shields.io endpoint are on the badge page.
- MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
- Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
- Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
- A2A Agent Card +8 pts — a2a/
-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 - Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
- Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
- Contract Quality scores 33.3 — up to +16.7 composite points
- Access Clarity scores 17.1 — up to +16.6 composite points
- Operational Transparency scores 7.9 — up to +12.0 composite points
Standards implemented 1
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
APIs 17
Individual APIs this provider publishes, each with its own machine-readable definition.
Payer API
Payer provides a modern B2B payments platform with APIs for payment initiation, invoice management, and reporting.
Payer All API
The All API from Payer — 1 operation(s) for all.
Payer Audit API
The Audit API from Payer — 1 operation(s) for audit.
Payer Changelog API
The Changelog API from Payer — 1 operation(s) for changelog.
Payer Documentation API
The Documentation API from Payer — 1 operation(s) for documentation.
Payer Events API
The Events API from Payer — 1 operation(s) for events.
Payer Export API
The Export API from Payer — 1 operation(s) for export.
Payer Invoices API
The Invoices API from Payer — 1 operation(s) for invoices.
Payer Oauth2 API
The Oauth2 API from Payer — 1 operation(s) for oauth2.
Payer Orders API
The Orders API from Payer — 4 operation(s) for orders.
Payer Page API
The Page API from Payer — 4 operation(s) for page.
Payer Payer API
The Payer API API from Payer — 1 operation(s) for payer api.
Payer Reader Access API
The Reader Access API from Payer — 1 operation(s) for reader access.
Payer Reference API
The Reference API from Payer — 2 operation(s) for reference.
Payer Search API
The Search API from Payer — 1 operation(s) for search.
Payer Users API
The Users API from Payer — 1 operation(s) for users.
Payer Version API
The Version API from Payer — 5 operation(s) for version.
Scroll for all 17
Event Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Payer Webhooks
ASYNCAPISemantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Payer Context
JSON-LDSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Payer API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions for this provider's data models.
GetApiV2OrdersInvoicesInvoiceidResponse
JSON SCHEMAPostApiV2OrdersInvoicesCreditCreditidRequest
JSON SCHEMAPostApiV2OrdersInvoicesInvoiceidRequest
JSON SCHEMAPostOauth2TokenResponse
JSON SCHEMAPutApiV2OrdersInvoicesSendRequest
JSON SCHEMASecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
Source (apis.yml)
Payer API — frequently asked questions
Does Payer have an API?
Yes. APIs.io lists 17 APIs from Payer, including Payer API, Payer All API and Payer Audit API, and 14 more.
Is there an OpenAPI specification for the Payer API?
Yes. APIs.io indexes 17 OpenAPI specifications for Payer, each linked for download from this page.
How do I authenticate with the Payer API?
Payer uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Payer Authentication.
Is the Payer API ready for AI agents?
Payer has a Kin Score of 28.7 out of 100 (thin) and an Agent Readiness score of 26.8 (agent-aware), scored by API Evangelist on 2026-11-06.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.