# Fyndiq > Fyndiq is Sweden's largest marketplace for bargains, connecting merchants with millions of deal-seeking consumers. The Fyndiq Merchant API lets merchants upload and manage product articles and retrieve, fulfil and cancel orders. It is a REST/JSON API secured with HTTP Basic Authentication, with a self-contained sandbox for integration testing. ## APIs - [Fyndiq Merchant API (developer portal)](https://developers.fyndiq.com/): Developer documentation home for the Merchant API. - [Merchant API reference (Postman)](https://merchantapi.fyndiq.com/): Full request/response reference for articles and orders. - [Merchant Center](https://merchantcenter.fyndiq.se/): Web console for merchants. ## Specs - [OpenAPI (derived)](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/openapi/fyndiq-merchant-api-openapi.yml): Merchant API, reconstructed from the published Postman collection (16 operations). - [Postman collection](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/postman/fyndiq-merchant-api.postman_collection.json): Verbatim published collection. ## Artifacts - [Authentication](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/authentication/fyndiq-authentication.yml): HTTP Basic (merchantID:token). - [Conventions](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/conventions/fyndiq-conventions.yml): Pagination, versioning, error envelope, environments. - [Error catalog](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/errors/fyndiq-problem-types.yml): 400/401/403/404/409/5xx. - [Sandbox](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/sandbox/fyndiq-sandbox.yml): Test environment + create-test-order. - [Data model](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/data-model/fyndiq-data-model.yml): Article, Order, Category. - [Agent skills](https://raw.githubusercontent.com/api-evangelist/fyndiq/refs/heads/main/skills/_index.yml): Manage catalog; fulfil orders. ## Docs - [Merchant Help Center](https://support.fyndiq.se/hc/): Support and merchant guides. - [Category tree](https://developers.fyndiq.com/category-tree/): Fyndiq category taxonomy. - [About Fyndiq](https://fyndiq.se/fyndiq/om-fyndiq/): Company information. - [Terms & policy](https://fyndiq.se/fyndiq/policy-och-villkor/): Terms and privacy policy.