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Communication Protocol Used in Cloud Mode {#sis-pymnt-svcs-cloud-mode-comm-protocol}
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When operating the solution in Cloud mode, the communication protocol used between the Acceptance Devices app and the point-of-sale (POS) system is a single HTTPS request to the backend.  
The transaction response can be sent either synchronously or asynchronously:

Synchronously
:
The POS system keeps the connection open until the transaction is completed and the response is provided with the full transaction details. The backend timeout setting is 180 seconds.

Asynchronously
:
The POS system receives a response with an interaction identifier after the transaction is started. The interaction identifier can then be used to check the transaction events. After the transaction is completed, the interaction identifier can be used to get the transaction identifier. The transaction identifier can then be used to get the full transaction and receipt details. For more information, see [Receiving Transaction Responses Asynchronously](/content/cybsdeveloper2021/amer/en/docs/cybs/en-us/sis-pax/integration/all/rest/sis-pax/sis-pymnt-svcs-cloud-mode-intro/sis-pymnt-svcs-cloud-txn-resp-async-api-intro.md "").
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