# API documentation > OpenAPI documentation for Onlinesim products. ## Full documentation (English) Complete Markdown export per API (parameters, schemas, examples). - [Onlinesim API](https://onlinesim.io/llms-full-onlinesim-api-un.txt): Full Onlinesim API reference (16 pages) - [Reseller API](https://onlinesim.io/llms-full-reseller-api-un.txt): Full Reseller API reference (29 pages) - [Alternative API](https://onlinesim.io/llms-full-alternative-api-un.txt): Full Alternative API reference (14 pages) ## Onlinesim API (Onlinesim-API-UN) Overview, auth, components, and custom guides. - [Onlinesim API](https://onlinesim.io/openapi_docs/Onlinesim-API-UN/info): Onlinesim API - [Authorization](https://onlinesim.io/openapi_docs/Onlinesim-API-UN/auth): Authorization - [Components](https://onlinesim.io/openapi_docs/Onlinesim-API-UN/components): Components ## Reseller API (Reseller-API-UN) Overview, auth, components, and custom guides. - [Reseller API](https://onlinesim.io/openapi_docs/Reseller-API-UN/info): Reseller API - [Authorization](https://onlinesim.io/openapi_docs/Reseller-API-UN/auth): Authorization - [Components](https://onlinesim.io/openapi_docs/Reseller-API-UN/components): Components - [Countries](https://onlinesim.io/openapi_docs/Reseller-API-UN/custom/countries): Countries - [Operators](https://onlinesim.io/openapi_docs/Reseller-API-UN/custom/operators): Operators - [Services](https://onlinesim.io/openapi_docs/Reseller-API-UN/custom/services): Services - [Testing](https://onlinesim.io/openapi_docs/Reseller-API-UN/custom/testing): Testing ## Alternative API (Alternative-API-UN) Overview, auth, components, and custom guides. - [Alternative API](https://onlinesim.io/openapi_docs/Alternative-API-UN/info): Alternative API - [Authorization](https://onlinesim.io/openapi_docs/Alternative-API-UN/auth): Authorization ## Optional - [All APIs in one file](https://onlinesim.io/llms-full.txt): Combined full text for all specs (large) - [Interactive docs](https://onlinesim.io/openapi_docs): HTML documentation with Try It Out