The Genesys Cloud for Salesforce integration is an add-on license to the base Genesys Cloud seat, which generally follows the base seat (e.g. named, concurrent, committed, overage, etc.). It is a per user, per month cost, that varies based on the buying method (but again, generally follows the base seat pricing so there is consistency between the two).
All of the documentation for the integration can be found in the Genesys Cloud resource center (https://help.mypurecloud.com/articles/about-genesys-cloud-for-salesforce/) which is linked from the AppFoundry listing.
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Richard Schott
Genesys - Employees
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