# Authentication ## Access Levels ReceiptHero API has two access levels: 1. Partner Application general access 2. User specific resource access ## Partner App general access To acces any endpoint partner app must include ReceiptHero API key in every request in custom HTTP header: ``` RECEIPTHERO_APIKEY ``` ## User specific resource access To access any resource that is owned by ReceiptHero user partner application must add OAuth access token to Http Authorization header: ``` HTTP_AUTHORIZATION Bearer ``` ! This access token is user specific so every user has different access token --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.receipthero.io/partner-app-api/authentication.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.