Paystone
Paystone is a Canadian payment processing and customer-engagement company headquartered in London, Ontario, positioning itself as one of the country's largest bank-independent payment processors. It sells card-present terminals, online checkout and hosted payment pages, virtual terminals, invoicing, and recurring billing to Canadian small and mid-sized businesses, and layers loyalty, gift-card, and reputation-marketing products on top of the payment rails. Paystone owns DataCandy, a long-standing Canadian gift-card and loyalty platform, and it is DataCandy that carries Paystone's public, self-serve, documented API surface: a live API Platform (Hydra/JSON-LD) REST API at api.paystone.com covering merchants, clients, contacts, gift/loyalty/ prepaid/promo account types, transactions, member and balance portals, and webhooks, authenticated with JWT bearer tokens and documented through an interactive Swagger UI. Paystone's core card-acquiring and payment-gateway processing is delivered as a merchant product rather than a publicly self-serve developer API, so the honest developer story here is the DataCandy gift-and-loyalty platform API, not a public payments/acquiring API.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Paystone the way a machine reads it — 18 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Paystone scores 45.2/100 (developing), with a separate agent-readiness read of 30/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Paystone's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
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title="Paystone on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/paystone.svg"
alt="Paystone Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/paystone/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/paystone/"
title="Paystone on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/paystone/card.svg"
alt="Paystone Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Paystone
Each block below is one kind of artifact we hold for Paystone. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 14
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Paystone Balance Portal API
The Balance Portal API from Paystone — 1 operation(s) for balance portal.
Paystone Client Management API
The Client Management API from Paystone — 3 operation(s) for client management.
Paystone Contact API
Resource 'Contact' operations.
Paystone Gift Account Type API
The Gift Account Type API from Paystone — 2 operation(s) for gift account type.
Paystone Item API
Resource 'Item' operations.
Paystone Loyalty Account Type API
The Loyalty Account Type API from Paystone — 2 operation(s) for loyalty account type.
Paystone Loyalty Transaction API
The Loyalty Transaction API from Paystone — 2 operation(s) for loyalty transaction.
Paystone Member Portal API
The Member Portal API from Paystone — 1 operation(s) for member portal.
Paystone Merchant Management API
The Merchant Management API from Paystone — 5 operation(s) for merchant management.
Paystone Prepaid Transaction API
The Prepaid Transaction API from Paystone — 2 operation(s) for prepaid transaction.
Paystone Promo Account Type API
The Promo Account Type API from Paystone — 2 operation(s) for promo account type.
Paystone Reward API
Resource 'Reward' operations.
Paystone User Management API
The User Management API from Paystone — 2 operation(s) for user management.
Paystone Webhook Management API
The Webhook Management API from Paystone — 2 operation(s) for webhook management.
Scroll within the panel for all 14 ·
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Paystone Datacandy Webhooks
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Paystone — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
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 2
Status, limits, changes, and where to get help
Commercial 3
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
← All providers · Data indexed from github.com/api-evangelist/paystone · machine-readable index on apis.io
This is an independent, third-party profile of Paystone, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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