> ## Documentation Index
> Fetch the complete documentation index at: https://pleo-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# API Keys Overview 

Another form of authorisation that Pleo supports is API keys and this form of authorisation is applicable, when:

* You are integrating Pleo with another application that does not support OAuth, for example, the applications that are deployed on-premises and these applications would also be included in the list of integration offerings that Pleo supports.
* You are a customer (company or organisation) interested in building a custom or bespoke integration with Pleo or temporarily ingest data from Pleo.

> [!NOTE]
>
> **Note**: You cannot use API keys to access the Legacy APIs; you must generate API tokens to use the legacy API endpoints.

You can generate two types of API keys:

* [Standalone API keys](https://pleo-preview.mintlify.site/docs/for-partners.md): Generate **standalone API keys** when you want to integrate your Pleo account with bespoke applications.
* [Integrated API keys](https://pleo-preview.mintlify.site/docs/integrated-api-key-generation.md): During the installation process of connecting your Pleo account with an application that is already existing in the list of supported integrations, the API keys that you generate are **integrated API keys**.


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