# API Reference Index

This section provides detailed information about the commands available in the Hyp API, their required and optional parameters, use cases, error codes, and code examples provided in Java, Python, and JavaScript.

The following commands are available in the Hyp API:

* [`addCgInvoice`](/enterprise/api-reference/addcginvoice.md)
* [`cancelDeal`](/enterprise/api-reference/canceldeal.md)
* [`doDeal`](/enterprise/api-reference/dodeal.md)
* [`getSessionId`](/enterprise/api-reference/getsessionid.md)
* [`inquireInvoice`](/enterprise/api-reference/inquireinvoice.md)
* [`refundCgInvoice`](/enterprise/api-reference/refundcginvoice.md)
* [`refundDeal`](/enterprise/api-reference/refunddeal.md)
* [`transmitInquire`](/enterprise/api-reference/transmitinquire.md)
* [`transmitTerminal`](/enterprise/api-reference/transmitterminal.md)

For a general overview of the Hyp API request and response structure, see [API Request & Response General Structure](/enterprise/introduction/request-and-response-general-structure.md).


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