aid: flatpay
name: Flatpay
description: 'Flatpay is a Copenhagen-headquartered payments company founded in 2022
  that sells card acceptance to small and medium-sized European merchants on a single
  flat per-transaction rate with no monthly subscription. Its product line is a PAX
  card terminal, an all-in-one point-of-sale system, an online payment solution for
  webshops built on the Frisbii (Billwerk+) platform, and Flatpay Capital merchant
  financing. The company operates in Denmark, Finland, Germany, Italy, France, the
  Netherlands and the United Kingdom, serves roughly 70,000 merchants, and reached
  unicorn valuation in 2025. Flatpay publishes no public developer portal, API reference
  or machine-readable specification: webshop integration is delivered through Frisbii+
  Pay plugins and a merchant-issued API key for the Frisbii gateway, which is operated
  by a different company.'
url: https://raw.githubusercontent.com/api-evangelist/flatpay/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.23'
created: '2026-08-16'
modified: '2026-08-16'
image: https://cdn.prod.website-files.com/675c2b1d9cefa24db1fdcafc/681a7a4079e0bf9e26fad636_en-open-graph-main-all-products.jpg
tags:
- Company
- Payments
- Point of Sale
- Card Terminals
- Merchant Acquiring
- Fintech
- Online Payments
- Denmark
- Europe
- Small Business
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.flatpay.com/
- type: Support
  url: https://www.flatpay.com/support
- type: HelpCenter
  url: https://help.flatpay.com/en/support/solutions
- type: Blog
  url: https://www.flatpay.com/blog
- type: Pricing
  url: https://www.flatpay.com/pricing
- type: Login
  url: https://portal.flatpay.com/
- type: TermsOfService
  url: https://www.flatpay.com/legal/terms-conditions
- type: PrivacyPolicy
  url: https://www.flatpay.com/legal/privacy-policy
- type: GitHubOrganization
  url: https://github.com/FLATPAY-DK
- type: StatusPage
  url: https://status.flatpay.com/
- type: Security
  url: https://flatpay.com/responsible-disclosure
- type: SecurityTxt
  url: well-known/flatpay-security.txt
- type: WellKnown
  url: well-known/flatpay-well-known.yml
- type: VulnerabilityDisclosure
  url: security/flatpay-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/flatpay-domain-security.yml
- type: LLMsTxt
  url: llms/flatpay-llms.txt
- type: Lifecycle
  url: lifecycle/flatpay-lifecycle.yml
- type: Plans
  url: plans/flatpay-plans-pricing.yml
- type: RateLimits
  url: rate-limits/flatpay-rate-limits.yml
- type: Packages
  url: packages/flatpay-packages.yml
x-enrichment:
  date: '2026-08-16'
  status: minimal
  artifacts_added: 9
  pass: local-v1
x-coverage:
  state: none
  reason: no-developer-program
  detail: >-
    Flatpay ships no developer program of its own — api.flatpay.com and
    developer.flatpay.com do not resolve, the 1,554-URL sitemap contains no
    /developers, /docs or /api path, and the help center's webshop-integration
    articles hand merchants an emailed API key and link out to Frisbii's
    billwerk.plus plugin pages, because Flatpay Online runs on the Frisbii
    (Billwerk+) platform operated by a different company.
  evidence:
  - url: https://api.flatpay.com/
    status: 0
  - url: https://www.flatpay.com/openapi.json
    status: 404
  - url: https://www.flatpay.com/sitemap.xml
    status: 200
  - url: https://help.flatpay.com/en/support/solutions
    status: 200
  - url: https://www.flatpay.com/.well-known/security.txt
    status: 200
  - url: https://www.flatpay.com/llms.txt
    status: 200
  checked: '2026-08-16'