# API Reference

## API Reference

- [Introduction](https://developers.nuvio.io/introduction.md)
- [Authentication](https://developers.nuvio.io/authentication.md)
- [Scopes](https://developers.nuvio.io/scopes.md): Scopes control what actions a token can perform.
- [Errors](https://developers.nuvio.io/errors.md): The Nuvio API follows HTTP status code semantics.
- [Accounts & Transactions](https://developers.nuvio.io/endpoints/accounts-and-transactions.md)
- [Customers & Suppliers](https://developers.nuvio.io/endpoints/customers-and-suppliers.md): All API Operations related with Customers & Suppliers
- [Expenses](https://developers.nuvio.io/endpoints/expenses.md): All API Operations related with Expenses
- [Income](https://developers.nuvio.io/endpoints/income.md): All API Operations related with Income
- [Payments](https://developers.nuvio.io/endpoints/payments.md): All API Operations related with payments of income and expenses
- [Products & Services](https://developers.nuvio.io/endpoints/products-and-services.md): All API Operations related with products & services
- [Projects](https://developers.nuvio.io/endpoints/projects.md): All API Operations related with projects
- [Tags](https://developers.nuvio.io/endpoints/tags.md): All API Operations related with tags
- [Taxes](https://developers.nuvio.io/endpoints/taxes.md)
- [Countries](https://developers.nuvio.io/common-models/countries.md): List of countries available in Nuvio API
- [Currencies](https://developers.nuvio.io/common-models/currencies.md)