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.

Paystone publishes 1 API on the APIs.io network: DataCandy API. Tagged areas include Payments, Canada, Payment Processing, Acquiring, and Gift Cards.

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

Paystone’s developer surface includes authentication, documentation, API reference, pricing, engineering blog, signup flow, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.7/100 developing ▬ flat Agent 41/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

1 APIs 1 MCP Servers

PaymentsCanadaPayment ProcessingAcquiringGift CardsLoyaltySubscriptionBillingMerchant Services

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 46.7/100 · developing

Contract Quality 14.0 / 21

Developer Ergonomics 8.0 / 17

Access Clarity 7.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.7 / 10

Discoverability 6.5 / 9

Regulatory Posture 5.9 / 15

Agent readiness — 41/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 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

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/. This rating is computed from github.com/api-evangelist/paystone: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

Paystone DataCandy API

The public, documented REST API for Paystone's DataCandy gift-card and loyalty platform, built on API Platform (Hydra/JSON-LD) and served from api.paystone.com. It exposes 28 do...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Login

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

AgentSkill

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

HelpCenter

HelpCenter

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: paystone
url: https://raw.githubusercontent.com/api-evangelist/paystone/refs/heads/main/apis.yml
name: Paystone
kind: company
description: '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.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Payments
- Canada
- Payment Processing
- Acquiring
- Gift Cards
- Loyalty
- Subscription
- Billing
- Merchant Services
tags_raw:
- Payments
- Canada
- Payment Processing
- Acquiring
- Gift Cards
- Loyalty
- Subscriptions
- Billing
- Merchant Services
tags_original:
- Payments
- Canada
- Payment Processing
- Gift Cards
- Loyalty
created: '2026-07-24'
modified: '2026-07-24'
specificationVersion: '0.23'
apis:
- aid: paystone:paystone-datacandy-api
  name: Paystone DataCandy API
  description: The public, documented REST API for Paystone's DataCandy gift-card and loyalty platform, built on API Platform
    (Hydra/JSON-LD) and served from api.paystone.com. It exposes 28 documented paths across 14 resource groups — client and
    merchant management, contacts, gift/loyalty/prepaid/promo account types, loyalty and prepaid transactions, rewards and
    items, member and balance portals, user management, and webhook management. All endpoints require a JWT bearer token.
    An interactive Swagger UI is published at api.paystone.com/docs and a machine-readable OpenAPI 3.1 export is downloadable
    from the same host.
  humanURL: https://api.paystone.com/docs
  baseURL: https://api.paystone.com
  tags:
  - Gift Cards
  - Loyalty
  - Prepaid
  - Merchant Management
  - Webhook
  tags_raw:
  - Gift Cards
  - Loyalty
  - Prepaid
  - Merchant Management
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/paystone-datacandy-openapi.yml
  - type: Documentation
    url: https://api.paystone.com/docs
  - type: APIReference
    url: https://api.paystone.com/docs
common:
- type: Authentication
  url: authentication/paystone-authentication.yml
- type: AgenticAccess
  url: agentic-access/paystone-agentic-access.yml
- type: DomainSecurity
  url: security/paystone-domain-security.yml
- type: Conventions
  url: conventions/paystone-conventions.yml
- type: ErrorCatalog
  url: errors/paystone-problem-types.yml
- type: Lifecycle
  url: lifecycle/paystone-lifecycle.yml
- type: Conformance
  url: conformance/paystone-conformance.yml
- type: DataModel
  url: data-model/paystone-data-model.yml
- type: MCPServer
  url: mcp/paystone-mcp.yml
- type: Webhooks
  url: asyncapi/paystone-datacandy-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/paystone-llms.txt
- type: Overlay
  url: overlays/paystone-datacandy-overlay.yaml
- type: Website
  url: https://www.paystone.com/
- type: DeveloperPortal
  url: https://api.paystone.com/docs
- type: Documentation
  url: https://api.paystone.com/docs
- type: APIReference
  url: https://api.paystone.com/docs
- type: Pricing
  url: https://www.paystone.com/pricing
- type: Blog
  url: https://www.paystone.com/resources
- type: HelpCenter
  url: https://help.paystone.com/
- type: StatusPage
  url: https://status.paystone.com
- type: Login
  url: https://hub.paystone.com/login
- type: SignUp
  url: https://start.paystone.com/sign-up
- type: TermsOfService
  url: https://www.paystone.com/legal
- type: PrivacyPolicy
  url: https://www.paystone.com/legal
- type: GitHubOrganization
  url: https://github.com/Paystone
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Paystone

Kin Score

APIs 1

Paystone DataCandy API

MCP Servers 1

Paystone MCP Server

Event Specifications 1

Paystone Datacandy Webhooks

Security Posture 2

Paystone Authentication

Paystone Domain Security

Agentic Access 1

Paystone Agentic Access

Resources