# API References

- [Session](https://fuseworks.gitbook.io/fusesign/api-references/session.md): Create and manage OAuth 2.0 Tokens
- [Bundle](https://fuseworks.gitbook.io/fusesign/api-references/bundle.md): A bundle is a collection of messages, settings, recipients, documents and optionally placeholders.
- [Customer](https://fuseworks.gitbook.io/fusesign/api-references/customer.md): The person who will be receiving the signing action.
- [Document](https://fuseworks.gitbook.io/fusesign/api-references/document.md): A file (.pdf) that is used for signing.
- [Tenant](https://fuseworks.gitbook.io/fusesign/api-references/tenant.md): An organisational construct within FuseSign.


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