> For the complete documentation index, see [llms.txt](https://docs.plock.io/plock-overview/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plock.io/plock-overview/use-cases/for-developers.md).

# For Developers

- [API](https://docs.plock.io/plock-overview/use-cases/for-developers/api.md)
- [Introduction](https://docs.plock.io/plock-overview/use-cases/for-developers/api/introduction.md): Plocks API offers the ability to send usage data (usage records) towards an endpoint. We use REST principles and the payload and responses are always in JSON format.
- [Authentication](https://docs.plock.io/plock-overview/use-cases/for-developers/api/authentication.md): This API requires an API key to identify and authorise requests. Please contact support@plock.io for instructions on how to create your API key.
- [Endpoints](https://docs.plock.io/plock-overview/use-cases/for-developers/api/endpoints.md): Browse available endpoints
- [Accounts](https://docs.plock.io/plock-overview/use-cases/for-developers/api/endpoints/accounts.md)
- [Subscriptions](https://docs.plock.io/plock-overview/use-cases/for-developers/api/endpoints/subscriptions.md)
- [Invoices](https://docs.plock.io/plock-overview/use-cases/for-developers/api/endpoints/invoices.md)
- [Usage](https://docs.plock.io/plock-overview/use-cases/for-developers/api/endpoints/usage.md)